Peel, wash and slice the potatoes. Spread the potatoes on a baking tray lined with baking paper. Sprinkle with salt, pepper and cayenne pepper. Wash the thyme, dab dry, put something aside for garnishing.
Pluck the leaves from the stems, sprinkle the rest over the potatoes. Sprinkle with 1 tablespoon of oil. Bake in the preheated oven (electric range: 225 °C/ convection oven: 200 °C/ gas: level 4) for 30-35 minutes until golden brown.
After half the baking time, turn once with a spatula. In the meantime, peel and finely chop the onion and garlic. Add 100 g quark to the minced meat and knead well. Season with salt and pepper.
Form into longish rolls. Heat 1 tablespoon of oil in a non-stick frying pan and fry the rolls on each side over medium heat for about 5 minutes. Wash, clean and seed the tomatoes.
Cut the flesh into cubes and put something aside for garnishing. Wash the basil, dab dry, put some aside for garnishing, chop the rest finely. Mix quark with tomato cubes and basil and season with salt and pepper.
Arrange rolls with curd cheese and potatoes. Garnish with herbs and tomato cubes.