Clean, wash and drain the lettuce, put the heart leaves aside and cut the remaining leaves into strips. Clean, wash and halve the tomatoes. For the vinaigrette, peel the shallot and dice very finely.
Mix vinegar, shallot, salt, pepper and sugar. Whip the oil into the mixture. Slice or coarsely grate the cheese as desired. Arrange salad and tomatoes on four breakfast plates. Drizzle the vinaigrette over them.
Serve sprinkled with cheese.