Asparagus Tomato Stir-fry

Ingredients

 * 1 tbsp cold water
 * 2 tsp soy sauce
 * 1 tsp cornstarch
 * ¼ tsp salt
 * 1 lbs fresh asparagus spears
 * 1 tbsp vegetable oil
 * 4 green onions, sliced diagonally into 1" pieces
 * 1½ cup fresh mushrooms, sliced
 * 2 small tomatoes, cut in thin wedges

Directions

 * 1) Combine first 4 ingredients in small bowl, stirring until blended. Set aside.
 * 2) Snap off tough ends of asparagus. Remove scales from stalks with a knife.
 * 3) Cut asparagus diagonally into 1½" pieces. Set aside.
 * 4) Pour oil around top of preheated wok, coating sides; heat at medium high for 2 minutes.
 * 5) Add asparagus and green onions; stir-fry 3-4 minutes.
 * 6) Add mushrooms; stir-fry 1 minute.
 * 7) Add reserved cornstarch mixture to vegetable mixture in wok; cook until thickened and bubbly.
 * 8) Add tomato, and cook just until heated.
 * 9) Serve immediately.