1In a large bowl, combine the Koikuchi soy sauce, Mirin, Sake, Grated garlic, Grated ginger, Grated onion, Grated apple, Sesame oil, Granulated sugar, and White sesame seeds to create the marinade.
2Add the Thinly sliced lamb shoulder to the marinade, ensuring each piece is thoroughly coated. Marinate for at least 30 minutes at room temperature, or up to several hours in the refrigerator.
3Prepare the vegetables by slicing the Sliced onion, Green bell pepper, Shiitake mushrooms, Cabbage, and Carrot into bite-sized pieces suitable for grilling.