Bring 3-4 l salted water (1 teaspoon salt per litre) to the boil. Peel garlic and chop finely. Clean and wash the zucchini and cut them first into pieces of about 5 cm width, then into thin sticks. Wash, seed and finely dice the tomatoes.
Rinse the prawns and pat them dry. Cook Cavatellino pasta in boiling salted water according to package instructions.
Heat the oil in a large frying pan. Fry the prawns for about 2 minutes while turning. Fry zucchini and garlic briefly. Season with salt and pepper. Add the tomatoes. Deglaze everything with cream, bring to the boil and simmer for about 5 minutes.
Season with salt, pepper and 1 pinch of sugar. Drain the pasta and serve with the sauce.