Peel the mango, thinly slice the flesh from the stone and then cut into cubes. Halve the avocados, remove the stone, scrape the pulp out of the skin with a tablespoon and cut into small pieces. Drizzle the pieces with lemon juice to keep them from discoloring.
Cut the chicken breast into strips, season with salt and pepper, fry briefly in the oil and then set aside. Wash the rocket and wash the tomatoes and cut in halves or quarters.
Gently mix the tomatoes, rocket, mango, avocado and chicken breast together in a bowl. For the dressing, beat all the ingredients together and pour over the salad before serving.