It has two key components, the meat and the marinate. While it can be made from chicken or pork, bulgogi is generally made of tender beef. The most tender, marbled cuts are used, such as flank steak, tenderloin, and top sirloin. If you’d like to splurge, you can use ribeye.  The marinade is made with traditional ingredients from Korean cuisine, such as soy sauce, brown sugar, rice vinegar or mirin, fresh minced ginger, and garlic. Also, based on preference the recipe can be made spicier by adding red pepper flakes.