Momofuku Marinated Beef Skirt Steak Ssam

Bahan-bahan (4 porsi)

• 2 lb / 1 kg skirt / flank / hanger steak ((Note 1))
• 2 cups apple juice
• ½ cup light soy sauce
• 5 g arlic cloves (, minced)
• 1/2 brown onion
• 1 tsp sesame oil
• 1 tsp freshly ground black pepper
• 8 oz / 250 g shallots/scallions (, thinly sliced)
• 5 g fresh ginger (, finely chopped or minced)
• 4 tbsp grape seed oil ((or another neutral oil))
• 1 1/2 tsp light soy sauce
• 3/4 tsp sherry vinegar
• 3/4 tsp salt ((adjust to taste))
• 1 tbsp ssamjang ((Korean fermented bean-and- chili paste, available in many Asian stores))
• 1/2 tbsp kochujang ((Korean chili paste, available in many Asian stores))
• 1/4 cup sherry vinegar
• 1/4 cup grape seed oil ((or another neutral oil))
• 3 small heads of Bib Lettuce (, leaves removed, washed and dried)