Low-Carb Gin & Tonic Cake

Yes, it’s here! I’ve finally cracked the long awaited low-carb gin and tonic cake. An all-natural, keto/low-carb, sugar-free, gluten-free cake, with added lovely gin, and no artificial sweeteners! What’s not to like?!

Jump to:
– Recipe for Low-Carb Gin & Tonic Cake
– Nutrition Count: Regular Gin & Tonic Cake vs Low-Carb Gin & Tonic Cake
– Health Impact of the Ingredients

The weather in the UK has been relatively good to us this summer – a little up and down, but never at temperatures below which a lovely fresh, cooling gin and tonic wouldn’t be welcome.

So people lounging on bar verandahs necking craft gin & premium tonics from enormous goblets sprinkled with exotic garnishes has been a common sight up and down the land for, oooh, at least the last three months. And at the start of the summer that sight reminded me of a gorgeous gin & tonic cake that I had baked last year, and it started to become the stuff of my waking dreams. But it was carbs-on-a-stick, and I’m being very good carbs-wise now, so if I was going to indulge again, I needed to concoct a low-carb version.

Followers of my Facebook page may remember that I had a go at that in early summer, but the original cake I came up with was too crumbly, too syrupy and too bitter from the inclusion of lime. So I had to go back to the drawing board, and I promised I would conquer it. One or two people have since asked me when the low-carb gin and tonic cake recipe is coming.

And so finally, now we are entering late summer, and after some extensive playing around in the kitchen, I have cracked it! Or at least I have cracked one version. For there are so many different styles in which you could make a low-carb gin and tonic cake that I intend to go on experimenting. I may well in future refine this recipe, or come up with an alternative one.

But today’s recipe is for an iced syrup cake that includes lemon, as well as gin and tonic. It has a quite syrupy and slightly grainy texture, that means you’ll want to eat it with a cake fork, rather than pick up a wedge with your fingers to shove in your mouth. But somehow it wouldn’t seem right for a cake containing gin and tonic to be eaten like that anyway.

And when making this cake I figured that – much as you would when pouring a gin and tonic – you should decide for yourself on the ratio of gin to tonic to suit your own taste. So that could range from anything from zero tonic, to mostly tonic.

Personally, I do like sipping and nursing single shots of neat craft gin. That’s partly so I can appreciate the different botanicals. We pay a lot for these fancy craft gins right? We want to taste them! But it’s also because it’s a good low-carb way of enjoying an alcoholic drink and making it last a long time.

So it follows that I prefer a higher ratio of gin to tonic in my cake. But even if you decided to ditch the tonic and use 100% gin in this recipe, then one slice of cake contains only around 11ml of gin. So practically nuns then, as a Catholic friend of mine is fond of saying!

Also, imho, the gin content is the crucial aspect that lifts up – what might otherwise be a relatively pedestrian loaf drizzle cake – to the level of decadence necessary for celebrating your birthday/anniversary/divorce/cat having kittens, whatever. It’s not the most fancy cake you’ve ever seen. But frankly, as adults on a low-carb regime, are we that bothered if it tastes good?

Gin-wise, go ahead and use whichever is your favourite. And you could always accompany a slice of cake with a gin and tonic too. One of my current personal favourite gins is Silent Pool – and it’s only coincidence that it’s made in my UK home county of Surrey. I really like its mild sweetness from the addition of local honey in the distillation. Similarly I’m fond of Dodds, which also has local London honey notes from street-wise urban bees. And it’s another coincidence that it’s distilled in my former longtime hometown of Battersea. I also like Williams’ Elegant 48, distilled in Herefordshire, has a beautiful citrusy flavour.

If I’m using a traditional garnish when drinking gin, then I usually prefer lime. But in this cake I’ve used lemon. I found that made the cake a little sweeter, and removed the slight overriding bitterness in my first attempt with lime. In a future recipe I’ll try grapefruit, or one of the other more exotic combinations of garnishes that have been used for gin and tonic since gin’s massive global resurgence and reinvention in the last decade. In a future cake, I’d like to try pairing the gin I use with the specific botanicals that would be used to complement it when served as part of a gin and tonic in a bar.

If you and your friends don’t scoff it all immediately, then any remaining cake will keep in an airtight container at normal room temperature for around 5 days. If, on the other hand, you’ve scoffed it all yourself, then I just leave here this cautionary picture – possibly still as relevant today as it was in 1751.

Gin Lane by Hogarth (1751)

Nutrition Count: Low-Carb Gin & Tonic Cake vs. Regular Gin & Tonic Cake

The numbers below compare the recipe here with the same recipe using white flour and sugar. Per slice (one-eighth of a cake) the low-carb cake has a minuscule 1g of net carbs – that is, a ginormous (haha, gin-ormous, geddit?!) 46g fewer carbs than the cake made with flour and sugar! And you save around 40 calories, with a very modest increase in your overall protein intake for the day too.

And as with so many of my low-carb swap recipes – and in line with the sugar-fat seesaw model that nutritionists talk about – you’re switching some of the carb content in the original for healthy fats in the low-carb version. So that’s why the low-carb version has higher healthy fats. On a keto diet, that’s a good thing

Per 1/8th slice of a cake Regular G&T cake* Low-carb G&T Cake*
Net Carbs (i.e. minus: fibre counted separately, & polyols in xylitol & erythritol – read my explanation here)  47 1
Kcal  351  310
Protein  3  5
Fat  12  20
Fibre  1 1

* Figures calculated using verified product information on the MyFitnessPal database. Figures will vary according to the ratio of gin to tonic that you choose. In both cases I used in total 30ml Fentimans Light Tonic Water and 90ml gin. 

Health Impact of the Ingredients

An up-front warning, in case it’s not obvious. While this cake is free of wheat, gluten, sugar and artificial sweeteners (depending what’s in the tonic you use), it contains real alcohol and almonds, so it’s not for kids or people with nut allergies

Looking at the ingredients in more depth, I’ve talked before about the scientifically-evidenced health benefits of almonds, eggs and grass-fed butter. And I wrote a whole post about the pros and cons of using xylitol as a sugar-substitute.

So let’s get straight into the nitty gritty about some of the key ingredients that I haven’t previously examined – gin, erythritol icing sugar substitute, and lemons.


Jan 2018 update: I’ve now published here a full article about natural sugar substitute erythritol. It covers what it is, its health benefits, how to cook with it, and where to buy it.

The bottom line is that erythritol is an all-natural sugar alcohol/polyol from which humans cannot absorb carbs. That means it has zero calories and net carbs. It does not have the bitter aftertaste associated with artificial sweeteners.

Erythritol may well be better tolerated by people with IBS than some other sugar alcohols like xylitol. It is not toxic to dogs, as xylitol is known to be. And it may confer some oral health benefits beyond the fact that you’re substituting it for tooth-decay-inducing sugar.


Citrus fruits such as lemons have antioxidant activity. That’s not just from their vitamin C – also essential as a co-factor for many enzymatic reactions in the body – but also from other phytochemicals, especially flavonoids.

Humans are one of the only species lacking the enzyme to convert glucose to vitamin C. And while the body regulates the amounts it holds in body fluid and tissue, since its water soluble, vitamin C isn’t stored in the liver or fat in the body and a (relatively small amount) has to be consumed every day for optimum health. So the lemon in this cake is going to help with that.


I’m sure you already know the broad pros and cons of drinking alcohol, without me telling you what they are. But in a nutshell, there’s a significant body of scientific thought that, in moderation, alcohol of any type (not just – famously – red wine), has some beneficial health impacts, both physically and mentally. And you also know that, as with most things in life, if you drink to excess – then what may well start off as good becomes bad, and you may pay the price by damaging your health.

You can read a good summary of the latest debate on all that in this scientifically-referenced article by the Harvard T.H. Chan School of Public Health. Its take-home message is that alcohol is both a tonic and a poison. But I guess you already knew that, right?

If you Google the health impacts of gin specifically, you will find articles like this one, from the (London, UK) Evening Standard. It sets out supposed ‘scientific reasons’ why gin is good for you. But it has absolutely no references to any authoritative science to back up any of the assertions made.

Pausing to go into rant-mode momentarily, these are precisely the sort of post-truth-world, science-lite, pieces that I rail against. This ES article is the sort of click-bait, newspaper-selling (although the ES is free these days) junk, that tells you what you want to hear, because gin is so popular now, and it will make you think that you can drink it guilt-free.

There might well be some scientific basis for some of the ES statements, but how can we know if we aren’t told on what science they’re based? And some of the statements are just blatantly fatuous. I mean come on re. #3, stop buying topical anti-wrinkle cream and drink gin instead?! And #6, ‘gin is the best natural remedy for kidney and liver disease’. Oh yeah, really??!! But I’m happy to stand corrected if you show me the science that says so.

Incidentally, the only point that I do agree with is #4. Gin is both low-carb, and also low-calorie relative to other alcoholic drinks. And I agree that in moderation it’s better drunk neat, rather than adding a mixer containing sugar or artificial sweeteners.

I did look into some of the ES points to see if I could find the science to back them up. I couldn’t immediately find any science articles about gin specifically.

Juniper berries are the main component of gin that the ES article suggests conveys healthful properties. I found several individual studies on juniper berries and extracts of its essential oil. This one, for instance, discusses the fact that juniper berries have been used as a herbal remedy for centuries for skin complaints, and that their flavonoids might be useful in alleviating some skin pigment disorders. And this one makes promising assertions about juniper’s antibacterial and antimicrobial properties. But these are single studies only.  And e.g. does any of this apply in the context of juniper berries appearing in the presence of alcohol in gin? As far as I could tell, that hasn’t been scientifically tested.

I’m not meaning to be a killjoy. I love gin and I will continue to drink it. My view is that if you want a slice of cake with gin in it, then you should have it. And as we have seen, many studies do suggest that alcohol and juniper may well have some positive physical and mental health effects. But the point I’m making is about not regarding that as an absolute, based on putting your trust in superficial and tenuous articles like the Evening Standard one mentioned above.

Having said all that, I suggest that you don’t over-consume this cake if you’re on a focussed weight-loss mission. Your body will use alcohol as a readily available source of fuel before anything else you consume at the same time, and before it burns fat. So it’s counter-productive to have too much and thereby switch off fat-burning for the day, if you’re trying to achieve that quickly by following a low-carb regime. Consuming alcohol won’t stop fat-burning, but it will pause and delay it until the energy from the alcohol consumed is used up.

Recipe for Low-Carb Gin & Tonic Cake

Prep time: 15 mins
Cooking time: 20-25 mins

Serves 8


For the cake

  • 110g (½ cup) unsalted butter
  • 110g (½ cup) erythritol (or xylitol)
  • 2 eggs (preferably omega 3 eggs)
  • 110g (1 cup) ground almonds
  • 1 tsp baking powder
  • Grated zest of 2 lemons
  • 60ml (1/3 cup) in total of gin and tonic, using proportions according to your taste ∗ (I use this tonic, which contains no artificial sweeteners. It contains a small amount of fructose carbs, but not enough to worry about).

For the syrup

  • 125g (heaped cup) erythritol or xylitol granulated sugar substitute
  • Juice of 2 lemons
  • 30ml (¼ cup) in total of gin and tonic, proportions according to taste ∗

For the icing/frosting

  • 50g (¼ cup) erythritol or xylitol icing/confectioners’ sugar substitute (or make your own using granulated erythritol/xylitol in an electric coffee grinder)
  • 30ml (¼ cup) in total of gin and tonic, proportions according to your taste ∗
  • Juice of half a lemon

∗ Vary the proportions of gin to tonic in the cake, syrup and icing according to your taste. Half gin and half tonic will give a mild alcohol flavour, but you may lose the flavour of the gin, depending on which one you’re using. I prefer to use more gin to tonic, to be sure that the gin taste cuts through the lemon flavour. In my cake, I used half gin and half tonic in the cake (i.e. 30ml of each), and 100% gin, and no tonic at all, in the syrup and the icing (so 30ml of gin in each).


  1. Preheat the oven to 180°C/Fan 160°C/350°F/Gas 4.

Make the Cake

  1. Line a loaf tin with buttered baking parchment. Or save yourself the bother and use a silicon ‘tin’, which is already non-stick.
  2. In a food processor with a dough blade, or with a wooden spoon, mix all the cake ingredients together until fluffy and pale
  3. Pour the mixture into the loaf tin and even out the top. It’a only going to come about half-way up the loaf pan. The cake slices will be more like ‘fingers’, rather than loaf slices.
  4. Bake for around 20 – 25 minutes (or until a knife/skewer inserted in the centre of the cake comes out clean – you know the drill).

Add the Syrup

  1. While the cake is cooking, put all the syrup ingredients in a saucepan over a low heat and stir until the xylitol has dissolved. It’s fine then for it to cool down until the cake is ready.
  2. When the cake is done, leave it to cool in its pan for 10 minutes. Get a cooling rack and put a piece of greaseproof paper underneath to catch any drips. Then carefully turn out the cake upside down onto the cooling rack.
  3. Pierce holes all over the cake with a skewer or thin knife. Then spoon the syrup evenly over the cake and leave it to soak in. You may need to do this in 2-3 batches.

Ice the Cake

9. Once the cake has completely cooled, mix together the icing/frosting ingredients to form a smooth paste. Drizzle this over the cake to cover it.
10. Finally, you can sprinkle a little lemon zest over the cake as decoration if you wish. Then serve on a pretty plate – it’s definitely what’s called for here!

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2 thoughts on “Low-Carb Gin & Tonic Cake

  1. I’ve just made your Gin and tonic cake (well without the tonic!). It’s absolutely delicious – and good for you 😀. I’ll have to wait until it’s after 5pm for another slice!! Xx

    1. Haha, I’m delighted! Thank you for the feedback. So glad you enjoyed it.

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