Bring 3-4 l salted water (1 teaspoon salt per litre) to the boil. Crumble bread, roast in a pan without fat. Grate parmesan, mix with crumbs. Cut tomatoes into strips. Clean, wash and slice the zucchini. Peel onion and garlic, chop finely.
Cook the pasta in boiling salted water according to the instructions on the packet. Add peas for the last 2 minutes. Fry tomatoes, zucchini, onion and garlic in hot oil for 4-5 minutes. Stir in ricotta, lemon juice and 100 ml pasta water, bring to the boil briefly. Season with salt and pepper. Drain the pasta and fold in. Serve and sprinkle with the cheese crumbs.