This german barley soup (graupensuppe eintopf) recipe is such a comfort food, especially when served the german way. This classic soup is amped up with bacon and vegetables to lend flavor to whole-grain barley. This would be considered an eintopf, or one-pot meal. The traditional suppengrn mixture (mirepoix) of leek, celery root, and carrot, plus potatoes and bacon give substance to an already hearty dish. Truly, this barley soup recipe is a meal in itself and there is 1 full serving of vegetables in each portion. See the note, below, for instructions on making this soup in a slow cooker. Makes 4 servings of german barley soup.