To make delicious yakiniku, you will need marinated beef. The beef is typically thinly sliced and marinated in a mixture of soy sauce, mirin, sake, sugar, garlic, and ginger. The marinade helps to tenderize the meat and infuse it with flavor. You can use different cuts of beef such as ribeye, sirloin, or skirt steak. Once the beef is marinated, it is ready to be grilled. The thin slices of beef cook quickly on a hot grill, resulting in tender and juicy meat with a caramelized exterior.