Name: Marble cake
Cook time: 15 min
Ingredients: 220 g all-purpose flour; 30 g lupin flour (can be replaced by chickpea flour or lentil flour); 20 g potato starch; 12 g baking powder; 2 g salt; 25 g cacao powder; 2 tsp vanilla sugar (or vanilla essence); 180 g granulated sugar; 250 g soy milk (or any other plant milk); 95 g vegan butter; 30 ml lemon juice; 1/2 lemon (the zest)