Szechuan Peppercorn Chicken

Name: Szechuan Peppercorn Chicken
Ingredients: 2 teaspoons szechuan peppercorns; 2 tablespoons scallions, chopped; 2 teaspoons fresh ginger, finely chopped; 1⁄2 teaspoon salt; 3 tablespoons soy sauce; 2 tablespoons sesame oil; 1 tablespoon chicken stock; 1 teaspoon red wine vinegar; 1 teaspoon sugar; 1 head iceberg lettuce, shredded; 1 1⁄2 lbs cooked shredded chicken