For the pasta, boil 3-4 l of water (approx. 1 teaspoon salt per litre). Wash and dice the tomatoes. Peel garlic and chop finely. Pluck Parma ham smaller. Wash the lemon hot, dab dry and finely grate the peel.
1⁄2 Squeeze lemon.
Cook the pasta in boiling salted water according to the instructions on the packet. Dice the mozzarella, season with salt and pepper. Wash the basil, shake dry and cut the leaves into strips. Mix mozzarella, basil, tomatoes, garlic, ham, lemon juice, lemon peel and oil.
Season to taste with salt, pepper and 1 tsp. sugar.
Drain the pasta and immediately mix it loosely with the tomato mixture in the pasta pot. Season to taste again.