Wash, clean and halve the tomatoes. Peel and chop the onions. Peel and halve garlic. Spread 2 tablespoons of oil evenly on the baking tray. Spread the tomatoes with the cut surface upwards, onions and garlic on top. Season with sea salt and pepper. Sprinkle with 2 tablespoons of oil. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for about 40 minutes.
In the meantime, finely crumble the bread for the crumbs. Wash the rosemary and shake dry. Cut 1 sprig into small pieces. Remove the needles from the rest and chop. Clean the chilli, cut lengthwise, wash and remove the seeds. Cut the pod into rings. Heat butter in a frying pan and roast bread crumbs in it while turning. Add the chilli and rosemary and fry briefly. Season with salt and pepper, remove from the pan.
Cook the pasta in boiling salted water according to the instructions on the packet. In the meantime, put tomatoes, except for 1-2 halves for garnishing, with onions, garlic and oil from the baking tray into a narrow pot. Puree finely with a blender (results in approx. 850 ml sauce). Heat while stirring and season to taste with salt, pepper, paprika and sugar.
Pour the noodles into a sieve, quench briefly, drain. Mix noodles and sauce and serve. Garnish with tomatoes, sprinkle with rosemary crumbs mixture.