After a day cooking stuffed cabbage rolls, I had everything left over: cooked rice, tomato juice, mirepoix vegetables (carrots, onions and celery), and some ground beef. Immediately I reached for the soup pot and began tossing in the odds and ends. With a tweak in proportions, and the addition of lemon and brown sugar, the stuffed cabbage ingredients rematerialized as a hearty sweet and sour beef cabbage soup. My husband Ted instantly proclaimed it "Blogworthy!", which is how we categorize recipes good enough to share with you. This is a forgiving soup; if you don't have tomato juice, use beef broth. If you're out of green cabbage, try red, or Savoy, or bok choy. Swap in ground turkey or chicken for the beef, or chop up some leftover rotisserie chicken. Add barley instead of rice. The soup freezes well, which makes it perfect for Soup Swap.