Stir-Fried Bok Choy

From Wisdom of the Chinese Kitchen

1 pound baby bok choy                                   
2 TBSP chicken broth
1 tablespoon oyster sauce                   
1 1/2 tsp thin soy sauce
1 1/2 tsp corn starch                                        
1/2 tsp sugar
3 tsp vegetable oil                                            
2 ginger slices
1 clove garlic, crushed and peeled
Separate the bok choy into stalks. Wash in several changes of cold water and drain thoroughly in a colander. Trim 1/4 inch from the bottom of each stalk. Halve each stalk lengthwise and cut stalks and leaves into 2-inch-long pieces. In a bowl, combine the broth, oyster sauce, soy sauce, cornstarch, and sugar.
Heat a 14-inch flat-bottomed wok or skillet over high heat until hot but not smoking. Add 1 1/2 teaspoons vegetable oil and ginger, and stir-fry 10 seconds or until ginger is fragrant. Add the remaining 1 1/2 teaspoons vegetable oil, bok choy, and garlic, and stir-fry 1 to 2 minutes, or until leaves are just limp and bok choy is bright green. Re-stir the broth mixture and swirl into wok. Stir-fry 1 to 2 minutes or until the sauce has thickened slightly and coats the vegetables. Serve immediately.