Vegetable Salad with Walnut and Avocado

I made this tossed salad for a friend who is on a diet :) Low in calories and delicious. Have some now and be energized. :-)

Ingredients for 2-3 servings
100 grams iceberg lettuce
1/2 of an avocado (cubed)
1 tomato ( diced)
1 small cucumber
3/4 cup walnuts
1 tablespoon olive oil
1 tablespoon lemon or calamansi juice
salt to taste

Procedure:
1. Combine everything and toss well.
2. Serve immediately with a smile.