Christmas Gingerbread and Walnut Rum Cake

Can you enjoy Christmas treats without cheating on keto? Of course you can! This Christmas keto and gluten-free gingerbread rum cake with toasted walnuts is the perfect way of making the most from your holiday while keeping your healthy and sugar-free keto diet on check and your goals on track!

It’s a high protein keto cake as well, as I used pea protein isolate as the main keto friendly “flour” here. Pea protein might not be the best for straight drinking in shakes, and its protein profile is also not as high quality as animal derived protein powders, specially whey. But! For high protein baking, pea protein is amazing. It really behaves more like low-carb flour than a protein powder.

Christmas keto gingerbread rum cake with walnuts.
High protein keto Christmas gains cake

We also add spices, walnuts, rum and a lot of ginger – it’s not a fake gingerbread cake! You know, how so many pumpkin spice things don’t really take pumpkin, but only the spice for pumpkin pie? Yeah, that is a major pet peeve for me. If a recipe has pumpkin or ginger in the name, it should actually have pumpkin or ginger in it, in my humble opinion.

What are the ingredients for the Christmas keto gingerbread and walnut rum cake

The flours: Pea protein isolate and fine flax meal flour combine to make this gingerbread rum cake into a healthy, high protein, high fat and low carb cake. Good for a keto Christmas, great for the keto gains.

The “fruit”: Instead of the dried fruits in traditional Christmas cakes, we use stem ginger. It’s a gingerbread cake, after all! Preserved sugar-free ginger gives out the “pieces of fruit” texture inside the cake.

The booze: spiced or dark rum is the best to add a bunch of flavor to this gingerbread rum cake! Yes, rum is keto friendly! – check out our alcohol on keto article.

A slice of keto Christmas gingerbread rum cake.

The nuts: Walnuts are the most popular and traditional of Christmas nuts, and are a perfect match for the ginger and rum!

The spices: Ground cinnamon, nutmeg and allspice are a classic gingerbread spice trinity!

The sweetness: Use any keto baking sweetener – 1:1 sugar equivalent of your choice, powdered to easily dissolve and fluff together with the butter. You can make your own blend with this recipe. Plus, a teaspoon of blackstrap molasses (black treacle) for the brown sugar flavor. If you prefer, you can substitute this for a brown keto sweetener, like this one.

Add sugar-free stem ginger for a “fruity” low-carb Christmas cake

Christmas rum cakes generally take a lot of extra sugary fruit in them – raisins, dried cranberries, sultanas, dried currants, glace cherries… We don’t want any of that glycemic inconvenience on a healthy, low-carb Christmas rum cake. So, I replaced all this sugary dried fruit with our own keto stem ginger, chopped in small pieces (about the size of sultanas). This way, we get the classic Christmas fruit cake texture in a keto version- without adding any sugar to the recipe!

Keto Christmas gingerbread cake with walnuts and spiced dark rum.

For the best results both in taste and texture, I recommend you to use our sugar-free preserved ginger recipe! But, if you want a quicker way to get your keto “fruit cake” pieces, you can make a smaller batch in less time.

Just wash and peel 150 grams (about 1 big knob) of fresh ginger, cut into real small pieces – the size the dried fruit in a cake should be – and boil it in water with (ideally) allulose or xylitol until it’s softened. You could use erythritol, but it will crystallize and be a bit crunchy, and that’s not the texture we are going for.

Lightly toast the walnuts for extra flavor

This step is optional, but highly recommended: you can make the walnuts even more flavorful and fragrant by bringing out its oils. You can achieve this by lightly toasting the walnuts in the oven at 150 °C (305° F) for about 15 minutes, until they are a coupe of shades darker.

Walnuts toast really quickly, so keep an eye on them so they don’t get burned.

After the walnuts cool down, take half of them and process in a food processor or blender, until they turn into a fine crumble. We will mix this toasted walnut crumble into the keto gingerbread cake batter. The other half of the walnuts can be broken down by hand, into smaller pieces.

Careful, again, as walnuts will go from crumbs to butter really quickly. Break down the other half of the walnuts in small pieces by hand.

How to make the keto Christmas gingerbread rum and walnut cake

Prepare the cake pan: Use a 9 or 10″inch pretty bundt pan. Grease it very well with butter or ghee, then dust with any keto flour.

Mix the dry ingredients together in a medium bowl: the pea protein isolate, flax meal, cinnamon, nutmeg, allspice, baking powder and xanthan gum.

Cream the butter on medium speed until pale and fluffy. You can use a standing or hand mixer. Slowly add the powdered keto sweetener, and continue mixing on medium speed for a couple more minutes, until it’s super fluffy.

Add the eggs, one by one, with the mixer running on slow speed. If you are using a hand mixer and aren’t an one handed egg cracking acrobat, you can crack the eggs into a separate bowl and give a quick mix and add them in a drizzle. Always use room temperature eggs, to avoid breaking the creamed butter.

Stop the mixer and add the dry ingredients mixture, plus the fine walnut crumble. Mix everything together with a spatula first, so the powders don’t poof up, then restart the mixer only to combine.

A slice of keto Christmas gingerbread and walnut rum cake.

Add the liquid ingredients: blackstrap molasses or black treacle, heavy cream and rum, and mix until the batter is smooth.

Fold in the sugar-free stem ginger pieces and the hand crushed walnuts.

Spread the batter in the prepared bundt cake pan, evenly. Hit the pan a few times against the counter to get rid of air bubbles between the pan and the batter, so you don’t have any holes on top of the keto gingerbread rum cake.

Bake in a preheated oven at 175 °C (347 °F) for about 1 hour and 10 minutes. When the keto Christmas cake starts pulling slightly from the sides of the pan and bounces backed when pressed, it’s probably done! Check with a toothpick, it should come out mostly clean.

Remove the keto gingerbread cake from the oven and wait 15-20 minutes before unmolding it into a cooling rack. After it’s completely cool, sieve powdered sweetener on the top for a snowy effect. I like to use this metal shakers, I keep each mine full with powdered erythritol, cinnamon and cocoa powder. These are my keto sprinkles 😄

Christmas keto gingerbread rum cake with walnuts.

You can make this cake even boozier, just drizzle some extra rum – to taste 😉 – on top of the cake. You can also mix the rum half and half with the preserved ginger sugar-free syrup. Wait for the keto gingerbread cake to absorb the liquid before adding the sweetener snow decoration.

This keto gingerbread rum cake, as with many spiced recipes, tastes even better on the next day, after the spices had some time to mingle and party. If you decide to prepare it on the day before, wait for it to cool down and cover it it plastic wrap. Sprinkle the sweetener before serving.

Gingerbread and Walnut Rum Cake

Keto Christmas gingerbread cake with walnuts and spiced dark rum.

This high protein keto, sugar-free and gluten-free gingerbread and walnut rum cake is deliciously crumbly and moist, crunchy and sticky, spicy and sweet. Each slice is a treat!

For US Cups conversion, check Notes

Prep Time: 30 minutes
Cook Time: 1 hour 10 minutes
Total Time: 1 hour 40 minutes

Ingredients

  • 220 grams butter
  • 200 grams powdered keto baking sweetener
  • 5 eggs (room temperature)
  • 120 grams pea protein
  • 30 grams flax meal
  • 200 grams toasted walnuts (100 grams processed, 100 grams crushed)
  • 150 grams preserved sugar-free stem ginger (See notes)
  • 125 grams heavy cream
  • 125 grams dark or spiced rum
  • 1 tablespoon baking powder
  • 1/2 teaspoon xanthan gum
  • 1 tablespoon ground cinnamon
  • 1 teaspoon allspice
  • 1 teaspoon blackstrap molasses (optional)
  • 1/2 teaspoon nutmeg

Instructions

  1. Lightly toast the walnuts in the oven ate 150 °C (305° F) for 15 minutes.
  2. In a food processor or blender, process half of the walnuts into a fine crumble. Break down the other half in small pieces by hand.
  3. Chop the preserved ginger into small, dried fruit size pieces (about the size of sultanas or raisins)
  4. Prepare a 9 or 10" bundt cake pan, grease it very well with butter or ghee, then dust with any keto flour
  5. Mix together in a medium bowl: the pea protein, flax meal, cinnamon, nutmeg, allspice, baking powder and xanthan gum.
  6. Cream the butter and powdered keto sweetener equivalent until pale, fluffy and doubled in size. You can use use the paddle attachment of the stand mixer (or whisks if using a hand mixer), on medium speed.
  7. Slow down the mixer and add the eggs, one by one, to the creamed butter.
  8. Add the dry ingredient mixture and the processed walnuts. Mix until fully combined
  9. Add the blackstrap molasses, heavy cream and rum, and mix until the batter is smooth.
  10. Fold in the ginger and the crushed walnuts.
  11. Spread the batter in a heavily buttered and floured bundt cake pan (or loaf pan)
  12. Bake in a preheated oven at 175 °C (347 °F) for about 1 hour and 10 minutes. When the cake starts pulling slightly from the sides of the pan and bounces backed when pressed, check with a toothpick, it should come out mostly clean
  13. Remove the keto gingerbread cake from the oven and wait 15-20 minutes before turning out the cake into a cooling rack. After it's completely cool, sift powdered sweetener on the top for a snowy effect.

Notes

US Cups approximate conversion: Use 1 cup (2 sticks) of butter, 1 1/4 cup of powdered keto baking sweetener, 1 cup of pea protein protein, 4 tablespoons of flax meal, 2 cups of walnuts, 3/4 cup of chopped sugar-free preserved ginger, 1/2 cup rum and 1/2 cup heavy cream. Other ingredients as indicated.

Click here for the preserved sugar-free stem ginger in syrup recipe. For a quick substitute, add 150 grams (about 1 knob) of chopped (sultana/raisin sized) fresh ginger, 4 cups of water and 1/2 cup of allulose or xylitol to a pan and simmer until the water is almost evaporated and the ginger is soft. Add more water if needed.

Nutrition Information:

Yield: 12 Serving Size: 1
Amount Per Serving: Calories: 388Total Fat: 33.7gCarbohydrates: 6.7gNet Carbohydrates: 4.6gFiber: 2.1gSugar: 1.4gProtein: 14.5g

Nutrition information is provided as a guideline only. Different brands of ingredients may have different nutrition facts. If tracking macros, remake the calculations using the nutrition facts from the labels of the ingredients you selected. Net carbs calculated exclude carbs from insoluble fiber and sugar alcohols.

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