Mix flour, milk, egg and salt to a smooth dough. Leave to swell for approx. 10 minutes
Wash the blueberries and drain well. Stir mineral water into the pancake batter
Heat the fat in a coated pan. Add the dough in portions and sprinkle with the blueberries. Bake for about 2 minutes at medium heat, then turn carefully and bake for another 2 minutes
Mix diabetic sweetness and cinnamon. Arrange the cakes on a plate and sprinkle with the cinnamon mixture. Serve as desired with a dollop of sour cream. Garnish with mint leaves if desired