Place first three ingredients in a medium soup pot, cover and bring to a boil. Reduce the flame to medium-low and simmer 30 to 35 minutes. Add onion, celery and carrot. Cover and simmer 5 minutes. Add sea salt, cover and simmer another 10 minutes. Add the leeks, cover and simmer another 3 to 4 minutes. Serve garnished with parsley.
Note: If using whole barley, soak overnight or 6 to 8 hours and simmer in the soaking water for about 1 hour or until slightly tender before adding remaining ingredients in the recipe.
Per serving - 83 calories, 0 g fat (4% calories from fat), 5 g protein, 24 g carbohydrate, 6 g fiber, 0 mg cholesterol, 206 mg sodium