Korean Barbecued Pork

Name: Korean Barbecued Pork
Ingredients: 1/3 cup mirin; 2 tablespoons soy sauce; 2 tablespoons Asian sesame oil; 1 tablespoon sesame seeds, lightly toasted and finely ground; 2 tablespoons minced garlic (about 4 cloves); 2 scallions, white and light green parts only, chopped; 2 tablespoons minced fresh ginger; 1 tablespoon Asian chili-garlic paste; 1/4 teaspoon freshly ground black pepper; 1/8 teaspoon crushed red pepper; 2 pounds boneless center-cut pork loin, sliced 1/2 inch thick and pounded 1/3 inch thick; Vegetable oil, for the grill; 1 large head of red-leaf or green-leaf lettuce, leaves separated; Miso, red pepper paste, chili-garlic paste and sliced hot green chiles plus thinly sliced scallions or kimchi, for serving