Place 100 g raspberries and 1 tablespoon of water in a small pot, cover and bring to the boil over a low heat. Mix in 100 g raspberries, remove from heat. Season to taste with a few drops of sweetener and set aside. Mix the fat, eggs, salt and 1 teaspoon of sweetener with the whisk of the hand mixer until creamy. Mix flour and baking powder, alternating with 75 ml milk. Put one half of the dough into a second bowl, stir in cocoa and 2-3 tablespoons of milk.
Heat up the waffle iron, coat the baking surface with a little oil. Spread half of the light and dark dough in blobs on top. Bake the waffles and let them cool down on a cake rack. Repeat the process with the remaining dough. Season the quark with lime juice and a few drops of sweetener. Serve waffles with quark and raspberries