The use of rye in a beer typifies the rye beer style, especially the German Roggenbier. Rye is also used in the Slavickvass and Finnishsahti farmhouse styles, as readily available grains in eastern Europe. However, the use of rye in brewing is considered difficult as rye lacks a hull (like wheat) and contains large quantities of beta-glucans compared to other grains; these long-chain sugars can leach out during a mash, creating a sticky gelatinous gum in the mash tun, and as a result brewing with rye requires a long, thorough beta-glucanase rest. Rye is said to impart a spicy, dry flavor to beer