Heat the butter in a 10-inch skillet over medium-high heat until melted. Add bratwurst coins and brown; turn and brown other side. Needn’t be done all the way through. Tip the browned wurst and any fat in the pan, barley, onion, turnip, potato, garlic, leeks, celery, carrots, cabbage, broth, water, tomato paste, salt, marjoram, thyme, black pepper, bay leaf, and Tabasco into a 6-quart slow cooker. Stir. Taste for salt. Cook on low for 6-7 hours. When done, taste and adjust seasonings. Serve hot garnished with freshly grated nutmeg and minced parsley. Pass the pepper grinder at the table. (When reheating, may need to thin soup with broth or water.)