Recipes are necessary for a many life skills. Recipes are somewhat like skills: they need to be learned only once and stay with you forever. They are initially items that, proving the player has the right level, can be learnt by right clicking them if they're in the inventory. Once a recipe has been learnt, they are the medium through which certain products can be produced. Recipes are needed for Cooking, Pharmacy, Casting, Sewing and Craft. Some can be bought from NPCs and your particular class master. Many rare ones, such as those needed for sewing, are only found as rare drops, for example from Yan Tomb bosses.