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. Clean and wash spring onions and cut into fine rings.
Wash the tomatoes, possibly halve them. Leave the bacon in a big pot, take it out. Prepare pasta in boiling salted water according to package instructions, drain. Meanwhile clean and wash the rocket and drain well.
Put 2 tablespoons of oil into the bacon pot. Melt the tomatoes briefly while turning them and take them out. Add spring onions to the frying fat and 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. Mix in the rocket. Arrange on plates.