1. The outer skin of lettuce can usually be removed with a paring knife. How to peel:Place the lettuce with the thin side facing up and the thick side facing down, then use a paring knife to scrape the lettuce from bottom to top until the skin is removed.

2. Peel the lettuce as long as there are no thick white stems of lettuce. You can pinch it with your fingernails after peeling. If you can pinch it in easily, you don't need to peel it anymore.