Peel and halve the onion and cut into strips. Wash the asparagus, cut off the woody ends. Cut asparagus into long thin slices. Wash, clean and slice the tomatoes. Heat oil in a pan.
Sauté the asparagus for about 4 minutes, turning. After 2 minutes add tomatoes, onion and olives and season with sugar, salt and pepper. Deglaze with vinegar. Clean, wash and shake the salad dry. Arrange lettuce and cooled asparagus on plates
20 minutes waiting time