Avocado and watercress salad - serves 4

Wash and dry the watercress, discard the bigger stalks, and put the cress in a salad bowl. Add the avocados, sliced thinly, and the pine nuts. Make a dressing with the walnut oil, lemon juice, salt, and pepper and pour over. Toss very gently, then chill, covered with a damp cloth, for an hour or so before eating.