1 large onion, chopped
1 cup chopped celery
2 tablespoons minced fresh ginger
1/8 teaspoon hot pepper flakes, or to taste
4 cups peeled chopped sweet potatoes
3 cups water
3 cups low sodium tomato juice
1 cup no-salt, no-oil-added peanut butter
1/4 cup chopped parsley or cilantro