12 ounces firm tofu

1/2 cup chicken stock or vegetable stock

2 tablespoons soy sauce

1/2 teaspoon sugar

1 tablespoon rice wine vinegar or dry sherry

2 teaspoons sesame oil

1 teaspoon cornstarch

2 tablespoons peanut oil, rice bran oil or grape seed oil

1 tablespoon minced ginger

2 large garlic cloves, minced

1/2 medium cabbage, chopped (about 1/2 pound, 5 cups chopped)

1 red pepper, cut in 2-inch long julienne

Salt and freshly ground pepper to taste

1/4 cup broken walnuts

Cooked rice or quinoa for serving