Cabbage takes the place of noodles in this low-calorie soup, but if you want to add more heartiness, add 2 ounces of pasta during the last 15 minutes of cooking or add a diced potato or two along with the water. I kept the sodium low by using water instead of broth, but for a richer flavor, you can add vegetable bouillon cubes to taste or use vegetable broth for half of the water.