Gluten-free chocolate and hazelnut cake

Ingredients

• 400 gram can black beans, drained and rinsed
• 100 gram coconut oil (you can use butter if not avoiding dairy)
• 4 heaped tablespoons coconut sugar (or use raw or demerara sugar)
• 4 large eggs
• 1 teaspoon vanilla extract
• 6 tablespoon cocoa powder
• 1 teaspoon baking powder
• 100 gram dark chocolate (70% cacao)
• 1 tablespoon coconut oil
• 1/4 cup toasted hazelnuts, roughly chopped