1 1/3 pounds boneless, skinless chicken breasts (about 4), cut into 1-inch pieces
1 tablespoon plus 4 teaspoons soy sauce
3 tablespoons dry sherry
1/4 teaspoon cayenne
2 tablespoons cooking oil
1 onion, chopped
2 cloves garlic, minced
1 teaspoon ground coriander
1 tablespoon wine vinegar
1/2 head Chinese cabbage (about 1 pound), sliced
3/4 cup drained sliced water chestnuts (from one 8-ounce can)
2 teaspoons tomato paste
1/4 teaspoon dried red-pepper flakes
3 tablespoons water
3 tablespoons chopped cilantro or scallion tops
1/8 teaspoon salt