Bring blueberries, cinnamon, aniseed and 1 tablespoon of sugar to a boil in a saucepan over medium heat. Stir starch and 1 tablespoon of water until smooth. Simmer blueberries for about 3 minutes, then bind with the starch. Let simmer for about 1 more minute, remove from heat, let cool down
Melt the fat. Mix flour, baking powder, baking soda and salt. Beat the eggs and 25 g sugar with the whisk of the hand mixer until foamy. First stir in butter, milk and buttermilk, then add the flour mix. Let dough rest for about 15 minutes
Whisk the sour cream, lemon juice, vanillin sugar and 1 tbsp. sugar with the whisk of the hand mixer for 5-7 minutes until thick and creamy. Keep cool until serving
Heat a rectangular waffle iron (12 x 21 cm; for 2 waffles). Grease the iron thinly before each baking process. Bake about 6 double waffles from the dough one after the other. Take them out and let them cool down on a cake rack. Halve the waffles and dust with icing sugar. Serve warm or cold waffles with sour cream and compote
Waiting time approx. 10 minutes