Grilled Steak Salad with Tomatoes & Avocado

I got this out of Taste of Home and it turned out to be really yummy.  I don't know why you couldn't use chicken either.  I used a pre-cooked pre-seasoned bag of steak strips from Sams club and left out the Creole so not sure how it would be with that included. But this is my kind of food :)

1 beef top sirloin steak (l 1/4 in.thick and 1 1/2 lb.)
1 Tblsp. olive oil
3 tsp. Creole seasoning
2 large tomatoes, chopped
1 can (15 oz.) white kidney or cannellini beans, rinsed and drained
1 can (15 oz.) black beans, rinsed and drained
3 green onions, chopped
1/4 c. minced fresh cilantro
2 tsp. grated lemon peel
2 Tblsp. lemon juice
1/4 tsp. salt
1 medium ripe avocado, peeled and cubed (1/2 in.)

Rub both sides of steak with oil, sprinkle with Creole seasoning.  Grill, covered, over medium heat or broil 4 in. from heat 5-8 minutes on each side or until meat reaches desired doneness (for medium-rare, a thermometer should read 145 degrees; medium, 160; well-done 170).  Let stand 5 minutes.
In a large bowl, combine the tomatoes, beans, green onions, cilantro, lemon peel, lemon juice and salt; gently stir in avocado.  Cut steak into slices; serve with bean mixture.