Wash and clean the tomatoes and cut them into large pieces. Clean, wash and drain the rocket well. Peel and halve onions and cut them into fine slices. Halve avocados, remove seeds. Peel and chop the avocado halves. Sprinkle the flesh with lemon juice
Roast sunflower seeds in a pan without fat, remove. Mix vinegar and sugar. Fold in oil in a thin stream. Season to taste with salt and pepper. Mix tomatoes, onions, rocket and avocados with the vinaigrette. Arrange the salad on plates and sprinkle sunflower seeds on top