Yes, the packages are customizable. If there is an item that you do not want or need a replacement ingredient, then the caterer will do that for you. The replacement item must be a quality product as the caterer may not be willing to use the cheaper product as it may reflect poorly on the taste of the dish. If you want to incorporate any specific recipes, inform the caterer well in time as they need to confirm with the chef on the possibility of it being done.