Dissolve the yeast in 450 ml of lukewarm water and add the baking mixture. Mix the ingredients with the dough hooks of the hand mixer at a low setting, then knead at the highest setting for 3 minutes to form a smooth, elastic dough. Cover the dough and let it rise for approx. 30 minutes
Roast pine nuts in a pan without fat. Cut tomatoes and mozzarella balls into 8 slices each. Mix the ciabatta dough carefully and briefly with a wooden spoon. Heat the waffle iron (10, 5 x 12.5 cm) and spread with olive oil.
Bake 8 waffles. Cover 4 hot waffles with 4 slices of tomato, 2 tablespoons of pesto and 4 slices of mozzarella, some pepper and another waffle and arrange them halved on plates. Sprinkle with pine nuts. Garnish with basil leaves