Heat 1/2 cup of broth in a soup pot over high heat. When broth is boiling, add onion, garlic and ginger. Cook for 3 minutes. Add soy sauce and the remaining 5 1/2 cups broth. Bring stock to a gentle boil. Add water chestnuts, bamboo shoots, broccoli, carrots, mushrooms, spinach, snow peas, cooked rice, celery, and black pepper. Bring to a simmer and cook for 10 minutes.
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