- Mix salad greens, tomatoes, onions, and cucumber in a large serving bowl.
- In a small bowl, mix lemon juice, garlic powder, ground black pepper, and salt. Pour over salad mixture and toss together.
- Cut avocado in half lengthwise. Remove pit and peel avocado halves. Slice into thin wedges, about 1/8-inch thick.
- Arrange avocado slices on top of salad and serve immediately.
Makes 6 servings - 1½ cups per serving.