Chop ¼ cup onion, ¼ cup tomato, ½ avocado. Mix chopped vegetables with 3 cups lettuce, 1½ tablespoons olive oil, and 1½ tablespoons lemon juice.
¼ cup onion, ¼ cup tomato, ½ avocado, 3 cups lettuce, 1½ tablespoons olive oil, 1½ tablespoons lemon juice