Absolutely! Pork tenderloin, and boneless, skinless chicken breasts or thighs can be cooked per the recipe instructions in place of the tofu: cut into bite size pieces, toss in cornstarch, and fry in hot oil. You can also use cooked chicken, pork, fish, or beef. Toss cooked protein into the stir-fry at the end of cooking just to coat it in the sauce and allow it to warm up.