Wash the rosemary and shake dry. Pluck needles from 1/2 twig. Peel garlic and cut in half. Peppers halve, clean and wash. Put the paprika halves, 1 sprig of rosemary and garlic on a baking tray lined with baking paper and roast in a preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for 15-20 minutes (skin may turn black).
Take out, let it cool down a little and remove the skin. Cut the pepper into cubes. Peel and finely chop the onion. Heat oil in a pot. Brown the rosemary needles briefly, then add the diced peppers and sauté briefly.
Add the stock and simmer for about 8 minutes. Prepare noodles in boiling salted water according to package instructions. Cut mozzarella into small cubes. Lightly puree the sauce and season to taste with salt and pepper.
Put the pasta on a plate. Spread sauce and mozzarella over it.