Bring 5 c of vegetable stock to a boil. Lower heat & add sesame oil, celery, carrot & garlic. Cover & simmer over low heat for 10 minutes. In the meantime, cook the noodles separately til lal dente. Drain & set aside.
Add turnip & white parts of scallions to the stock pot. Simmer for 5 minutes. Add rest of the ingredients except tofu, miso & noodles & simmer, covered, till cooked. Add the noodles & tofu. Remove from heat.
Dissolve miso thoroughly in 1/2 c warm water. Stir into soup. Serve immediately.
Nava Atlas, "Vegetariana"