This soup can scare away the chill of any day in one spoonful. Pair it up with Russian Black Bread, or the best house Pumpernickle Bread you can find or bake for a meal that is staying and flavorful as you could wish for. To make this meatier, add chunky beef bones or some strips of flank steak. To serve this as refined but hearty fare, serve smaller portions, top with sour cream, finely shredded pickled or cooked beets and fresh herbs dusted on top. The real secret to this fabulous rustic soup is the interplay between the brown sugar, cabbage, onions, and citric acid. It is an immediate hit of sour/sweet. Citric acid is available at pharmacies, health food stores or online from places such as King Arthur. If you don't have it, use the lemon juice substitute.