Cut the beef brisket into bite-sized pieces.
Wash the lettuce thoroughly and drain the water.
Heat a pan and stir-fry the beef brisket over high heat until cooked.
Tear the lettuce into large pieces and place in a bowl.
Add chili powder, minced garlic, vinegar, salt, and sesame oil to the lettuce and toss well.
Serve the beef brisket and seasoned lettuce together on a plate.