Sichuan Pork Stir Fry

Name: Sichuan Pork Stir-Fry
Ingredients: 6 leaves stem lettuce (celtuce), cut into 1/2-inch pieces; 1 pinch salt; 2 teaspoons water; 1 teaspoon cornstarch; 0.5 pound lean pork, cut into 1/2-inch cubes; 1 teaspoon rice wine (sake); 0.25 teaspoon salt; 2 tablespoons chicken stock; 2 teaspoons soy sauce; 0.5 teaspoon Chinese black vinegar; 0.5 teaspoon white sugar; 3.5 tablespoons vegetable oil; 1 tablespoon finely chopped pickled red chile peppers; 2 teaspoons chili bean sauce ((toban djan), such as Lee Kum Kee®); 3 spring onions, diced; 2 cloves garlic, sliced; 1 (1/2 inch) piece fresh ginger, sliced