Grease a baking form well and preheat the oven to 180 ° C. Mix the flour, cane sugar, baking powder, vanilla sugar and salt in a mixing bowl. Then stir in the frying oil and plant milk until the dough no longer clumps. Don´t stir too long. Divide the dough into 2 bowls to make a light and dark dough. For the dark dough, stir in the carob powder and 2 tablespoons of plant milk. Pour light and dark dough alternately into the baking form and pull a fork through the dough to create a pattern. Bake in the oven at 180 ° C for 60 minutes. Let the cake cool in the form for at least 1 hour. Overturn on a wire rack and let cool down completely.