Dried lemon peel is made from just the "zest" portion of the lemon which is removed and dried. You can purchase this product online at shops like The Spice House and Penzeys. The dehydrated zests are three times stronger than fresh zest so use 1 teaspoon per tablespoon called for in your recipe.
This product is typically used in baked goods like muffins, cakes and cheesecakes.