Separate whole lettuce leaves from stalk. Wash and fully air or towel dry. We don’t want no soggy lettuce!
While the lettuce is drying, shred and heat leftover chuck roast until warm. You can do this in the microwave or on the stove top for a few minutes.
Let each person create their own wraps by layering the meat, salsa, and avocado on top of a lettuce leaf. Gently wrap the lettuce to keep the filling from falling out, and eat with your hands. Enjoy!