1-1.5 lbs. of thinly sliced rib-eye steak purchased from a Korean market. Or you can slice your own rib-eye or sirloin steak across the grain in paper thin slices. Partially freezing the beef helps with cutting clean slices.
1/3 cup of soy sauce or for a Gluten-Free variation, use San-J Organic Tamari Wheat Free Soy Sauce found in the health food section of your local grocery store.
3 Tbl white sugar
1 Tbl sesame oil
3 cloves of garlic, minced
1/4 of a medium yellow onion, halved and sliced into medium moon shaped slivers
2 green onions including the white parts, finely sliced into small pieces
2 Tbl toasted sesame seeds
1/4 tsp of red pepper flakes
2 pinches of black pepper
optional 1/4 tsp. of ginger, finely minced