Cabbage Soup

INGREDIENTS: 1/4 cup (1/2 stick) unsalted butter 1 medium onion, diced 1 medium shallot, diced 1 celery rib, diced 1 medium carrot, peeled and grated 1/2 head green cabbage, sliced thin 1/2 head purple cabbage, sliced thin 2 quarts (8 cups) vegetable broth 1 bay leaf 4 red potatoes, peeled and cubed 2 plum tomatoes, […]