Wok Sauteed Mushrooms and Tofu

Name: Wok Sauteed Mushrooms and Tofu
Ingredients: 1 package (14 ounces) firm tofu, drained; 2/3 cup vegetable broth; 1 1/2 tablespoon hoisin sauce; 1/2 teaspoon sesame oil; 2 tablespoons cooking oil; 1 leek (1-inch diameter), white part only, cut into 1/4-inch-thick rounds; 1 serrano or jalapeno chili pepper, thinly sliced; 1/2 pound small white button mushrooms, halved; 1/2 pound portobello mushrooms, sliced into 1-inch squares; 6 medium fresh shiitake mushrooms, stems discarded, quartered; 1 1/2 teaspoon cornstarch dissolved in 1 tablespoon water