Peel the skin from the chorizo and cut the sausage into slices. Cut olives into slices. Clean and wash the zucchini, cut in half lengthwise and slice. Peel onion and garlic and chop finely. Clean and wash spring onions and cut them into rings.
Heat 1 tablespoon of oil in a large pot. Brown the sausage in it. Remove any cooking fat that may have formed. Add onion cubes and garlic to the sausage and fry briefly. Add the noodles. Add stock and tomatoes together with juice. Season with salt, pepper and sugar. Bring to the boil and simmer for about 15 minutes, stirring occasionally.
Heat 1 tablespoon of oil in a frying pan. Sauté the zucchini in it, fry the spring onions briefly. Fold the vegetables and olives into the pasta sotto. Continue cooking for 2-3 minutes, trying in between so that the pasta does not get too soft. Season everything again. Wash basil, shake dry, pluck leaves and fold in. Serve with freshly grated Parmesan cheese.