Soak bread in cold water. Peel and finely chop the onion. Squeeze the bread. Knead the mince, bread, onion, mustard, egg, 1 teaspoon salt and 1 teaspoon pepper with the dough hooks of the hand mixer.
Form small meatballs from the chopping mass with moistened hands. Heat 2 tablespoons of oil in a large pan and fry the meatballs for 4-5 minutes, turning them over. Take them out. In the meantime, clean and wash the spring onions and cut them into fine rings.
Wash and possibly halve the tomatoes. Leave out bacon in a large bacon pot, remove. Prepare pasta in boiling salted water according to package instructions, drain and quench briefly. In the meantime, wash the basil, shake dry and pluck the leaves from the stalks.
Put 2 tablespoons of oil into the pot and melt the tomatoes briefly while turning them and take them out. Add spring onions to the frying fat, fry, add bacon again, deglaze with cream, bring to the boil, add parmesan cheese and cream cheese and heat while stirring.
Season to taste with salt, pepper and lemon juice. Add pasta, meatballs and tomatoes, heat up again briefly. Add basil, except for a few leaves to garnish. Garnish with basil on plates.