The term DARK BREAD GRAIN refers to the grain RYE, which is a cereal grain that is used in many different types of bread. RYE is a dark-colored grain that has a slightly sweet and nutty flavor. It is often used in combination with wheat flour to make breads, such as pumpernickel and other dark breads. RYE is also used to make beer and whiskey. RYE is a popular grain in many parts of Europe, particularly in Germany, Poland, and Russia.