This delicious cake consists of a fudgy, hazelnut-infused, deeply chocolatey sponge made extra indulgent by lashings of Sweet Potato Chocolate Buttercream.
The grain-free sponge is a simple affair made using ground hazelnuts for Nutella-like flavour, and is naturally sweetened with puréed dates.
It’s a versatile recipe that works with any type of oil you want, such as olive, coconut or vegetable oil, but several readers have also had success substituting this with applesauce, so you could go down that route if you’d prefer to keep it oil-free.
It’s not a fluffy sponge, but rather a fudgy, gooey one that really resembles the melt-in-your-mouth texture of a chocolate truffle!
The luxuriously smooth, rich and velvety chocolate buttercream frosting is a truly magical recipe made using a few simple ingredients, all thanks to the secret addition of the sweet potato that provides the perfect naturally sweet and creamy base.
Then you can decorate the cake with whatever you wish – I went for rose petals as I love how pretty and delicate they look. This cake is perfect for birthdays or special occasions, but also conveniently happens to be secretly healthy, so you could even eat it for breakfast if you like!
For more chocolate cakes, check out my:
- Gâteau au Chocolat
- Tahini Frosted Chocolate Cake
- Chocolate Sponge Layer Cake
- Black Forest Cake
- Peanut Butter Chocolate Cake
- Chocolate Hazelnut Cake
- Chocolate Truffle Cake
If you try out this recipe or anything else from my blog, I’d really love to hear any feedback! Please give it a rating, leave a comment, or tag a photo #rhiansrecipes on Instagram! Thank you.
This Gluten-Free Vegan Chocolate Hazelnut Truffle Cake is easy to make, super rich and indulgent and secretly healthy too!
- 15 small dates soaked overnight in cold water or for 10 minutes in boiling water
- 200 g (1 cup) ground hazelnuts
- 4 tablespoons cocoa powder
- 4 tablespoons oil* (coconut, olive or vegetable oil)
- 1/4 teaspoon bicarbonate of soda
- 60 ml (1/4 cup) milk, any kind
- Optional: Salt, to taste
- 2 medium-sized sweet potatoes (about 400g/14oz)
- 2 tablespoons cocoa powder
- 1 teaspoon vanilla extract
- Salt, to taste
- 3 tablespoons maple syrup, to taste (or sub any other sweetener)
- 1 teaspoon coconut oil*
Preheat oven to 180 degrees (350 degrees)
Drain away most of the water from soaking the dates, leaving a little bit
Use a food processor or a stick blender to blend the dates into a smooth purée (leaving a little water will make it much easier)
Add the puréed dates into a bowl along with all the other ingredients and mix well
Divide the mixture between two greased and lined round baking tins (I used 18cm/7inch tins)
Bake in oven for around 15 minutes
Once out of the oven, transfer to a wire rack to cool completely
Cook sweet potatoes by boiling, steaming or roasting them until very soft and tender
Discard any skins, and add to a food processor or blender along with all other ingredients
Whizz until completely smooth. Taste and adjust ingredients as necessary - add more maple syrup for sweetness, more salt for saltiness, more cocoa powder for chocolate flavour etc
Leave to cool before using to frost the cake
Place one half of the cake onto a plate and spread just less than half of the buttercream onto it
Place the other half of the cake on top of that and use rest of buttercream to spread on top and around sides of cake
Decorate with rose petals or whatever else you fancy!
Keeps covered in the fridge for up to a few days
*Several readers have told me they made this cake oil-free by substituting the oil with applesauce, which seems to have worked well. So please do this if you're looking for an oil-free cake! The coconut oil in the buttercream can be omitted, but the taste may not be quite as delicious!
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