Remove the stalk of the tomatoes and scratch the skin. Scald the tomatoes with boiling water. Rinse cold and peel skin. Cut tomatoes into quarters, remove seeds. Cut the flesh into pieces.
Peel the garlic and cut into fine slices. Heat 1 tablespoon of oil in a saucepan and sauté the garlic in it. Add diced tomatoes and bay leaf. Cover and let simmer for about 20 minutes at low heat.
Wash the zucchini, dab dry and cut into fine slices. After 10 minutes cooking time add to the tomato sauce. Season the sauce with salt and pepper. Wash the basil, dab dry and chop finely except for something to garnish and add to the tomato sauce.
Cook the spaghetti in boiling salted water for about 10 minutes. In the meantime, peel the prawns and remove the gut. Heat 2 tablespoons of oil in a frying pan and fry the prawns. Season with salt, pepper and lemon juice and add to the sauce.
Drain the spaghetti and toss in the remaining oil. Mix spaghetti and sauce in a large pot and divide into 4 plates. Garnish with basil.