Soak the tomatoes in 200 ml of warm water in a shallow bowl. Peel onions and cut them into large pieces. Clean and wash the peppers and cut them into large pieces. Put the paprika and onion pieces on a baking tray coated with oil and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 35-45 minutes.
Cook the pasta in boiling salted water according to the instructions on the packet. Remove the peppers and onions from the oven and place them in a tall container. Add tomatoes and about 100 ml soaking water. Add peanut butter and harissa and blend finely with a hand blender. Season with salt, pepper and turmeric.
Put the sauce in a large pan. Drain the noodles, add them and heat everything up again. Wash the rocket and dab dry. Grate cheese finely. Arrange pasta mixture on plates, sprinkle with rocket and parmesan.