1Thoroughly clean the Beef small intestines: Place the Beef small intestines in a large bowl, sprinkle with Salt and Wheat flour. Vigorously rub and massage the Beef small intestines for several minutes to remove impurities and odor. Rinse under cold running water until the water runs clear and no residue remains. Repeat the cleaning process with fresh Salt and Wheat flour if necessary. Drain well and pat dry.
2Prepare the marinade: In a bowl, combine Soy sauce, the 30g of Minced garlic (for marinade), Minced ginger, Soju, the 15g of Sesame oil (for marinade), Black pepper, Sugar, the 30g of Green onion (chopped for marinade), and the 50g of Onion (sliced for marinade). Mix well.
3Marinate the Beef small intestines: Add the cleaned Beef small intestines to the marinade, ensuring they are fully coated. Cover the bowl and refrigerate for at least 1 hour, or preferably 3-4 hours, to allow the flavors to meld.