Cook the penne in salted water according to the instructions on the packet. Peel the asparagus on the lower third and cut into 4 cm long pieces. Cook with a little oil in the pan over low heat until al dente. In the meantime, add sugar, 1 tablespoon lemon juice and salt and turn regularly.
Meanwhile, cut the tomatoes and mozzarella into small cubes. Chop the parsley.
Prepare a fruity vinaigrette with olive oil, vinegar, the remaining lemon juice, salt, pepper and possibly a little honey. The quantities given here are only an estimate, you should do this according to your feeling and taste.
Mix the penne, asparagus, tomatoes, mozzarella, parsley and vinaigrette together. Serve warm.