In a large pot, combine peas, barley, water, bay leaves, salt, shoyu, thyme, garlic, sage and cumin. Bring to a boil over high heat. Reduce heat to a low simmer, cover and cook for about 20 minutes, stirring occasionally.Stir in carrots, onion, and celery. Cover and simmer until vegetables are tender, another 25 to 30 minutes, checking periodically and adding small amounts of additional water if needed.Discard bay leaves. Ladle soup into warmed soup bowls and garnish with green onion tops, if desired.