Rinse duck breasts, pat dry. Cut the skin with a sharp knife in a diamond-shaped pattern. Sprinkle salt and pepper on both sides. Heat 1 tablespoon of oil in a frying pan, fry duck breasts over high heat on both sides.
Reduce heat and fry for about 6 minutes on each side. In the meantime, wash and clean the rocket and salad and drain well. Wash, clean and halve the tomatoes. Slice the parmesan into thin shavings.
For the vinaigrette, mix vinegar with salt, pepper, mustard and sugar in a bowl. Finally, gradually fold in 5 tablespoons of oil. Pluck the salad into mung-sized pieces. Put half of the tomatoes with the sliced parmesan on toothpicks.
Arrange lettuce and rocket with the tomatoes and tomato skewers on plates. Drizzle with the vinaigrette. Cut the duck breast into slices and arrange on the salad. Garnish with parsley as desired.