Finely puree the beetroot in a high container with the cutting stick. Stir in 4 drops of food colouring. Cream fat, salt, 275 g sugar and vanilla sugar with the whisk of the hand mixer. Stir in the eggs one after the other. Mix flour and baking powder. Stir the crème fraîche first, then the flour mixture into the fat-sugar mixture
Grease a box form (2 litres capacity; 30 cm length) and dust with flour. Halve the dough. Stir poppy seeds into one half and pureed beetroot into the other half. Fill in 1/3 poppy seed dough and smooth it down. Add 1/3 beetroot dough and marble with a fork. Pour the rest of the dough into the mould in the same way. Brush smooth. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 1 hour. Cover if necessary after about 30 minutes baking time. Leave to cool in the mould for approx. 10 minutes, turn out of the mould and allow to cool
In the meantime, finely crush 2 tablespoons of sugar with 2 drops of food colouring in the universal chopper. Dust the cake with it
waiting time approx. 1 1/2 hours