Wash the rocket and let it drain well, sort out a little if necessary. Wash the cherry tomatoes and cut in half. Peel and core the avocado and cut into cubes (1 - 2 cm).
Cut the feta cheese into cubes about the same size. Peel the garlic and cut into very fine cubes. Peel the onion, cut in half and cut into wafer-thin slices.
Drain and add the olives. Mix with the remaining ingredients and season with salt, pepper and sugar.