Crucial to beloved deli sandwiches like pastrami and corned beef-based Reubens, rye bread can come light, medium or dark, depending on which part of the rye berry is used to make the flour. In Europe, bakers tend to use 100% rye flour, while in the U.S., rye bread may be mainly made from wheat flour. Some recipes call for adding caraway or dill seeds on top.
