Shanghai Sticky Rice Siu Mai

Name: Shanghai Sticky Rice Siu Mai
Ingredients: 4 to 6 dried black mushrooms; 1 tablespoon soy sauce; 1 tablespoon oyster-flavored sauce; 2 teaspoons dark soy sauce; 2 teaspoons sesame oil; 1/2 teaspoon sugar; 2 tablespoons vegetable oil; 1/4 pound ground pork; 1/4 cup finely chopped smoked ham; 2 cups cooked glutinous rice, at room temperature; 1/4 cup finely chopped bamboo shoots; 1/4 cup finely chopped water chestnuts; 1 green onion, trimmed and finely chopped; 1 package (16-ounce) siu mai wrappers; 1/4 cup frozen peas, thawed; Cabbage leaves, optional