1.Spray heated large saucepan with oil; cook onion and celery, stirring, until vegetables soften.
2.Add stock, the water and sauce; bring to the boil. Add mushrooms and five-spice; return to the boil. Reduce heat; simmer 2 minutes or until mushrooms soften.
3.Just before serving, sprinkle with chives.
Other varieties of mushrooms, such as button or shimeji, can also be used in this recipe.