Wash the tomatoes, dab dry and cut off the lids on the stem side. Hollow out the tomatoes. Cut the flesh into small cubes. Cut mozzarella and ciabatta into small cubes as well.
Wash the basil, dab dry, chop finely and put something aside for garnishing. Roast the pine nuts in a pan without fat, remove. Add oil and roast ciabatta in it until golden brown. Mix ricotta and quark.
Stir in the tomato interior, mozzarella, croutons and basil and season with salt and pepper. Coarsely chop the pine nuts. Fill the tomatoes with the ricotta cream and place on a baking tray lined with baking paper.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 10-15 minutes, remove. Garnish with basil and sprinkle with pine nuts.