For added heat, stir 1 tsp. crushed red pepper into stir-fry before topping with nuts and cilantro.
Substitute 2 cups frozen vegetables, such as a stir-fry mix or peas and carrots, for the cut-up fresh vegetables. Prepare salsa mixture and cook steak as directed. Add frozen vegetables along with salsa mixture, then simmer until heated through. Continue as directed.
You can buy steak and chicken already cut into strips at most grocery stores. Vegetables, such as broccoli, peppers and carrots, are also available pre-cut in bags in the produce section of many larger supermarkets.