Check it—korean barbequed beef marinade recipe for your convenience and enjoyment, straight from the mouth of Sun Kerl, aka, mum.

Bul-gogi Marinade

2 lbs round roast (Beef), sliced very thin, have the meat guy do this for you. Better beef works as well.
5 cloves of garlic (big cloves)
1/2 large sweet onion, or 1 small sweet onion
1/2 cup Coca-Cola
1/2 cup soy sauce
1/2 cup brown sugar
1 teaspoon pepper
1 Tablespoon sesame oil [optional]
Dash of salt to taste

Directions: Chop up onion and garlic or use a food processor. Mix in all other ingredients and stir well. Place meat in marinade, and place in fridge overnight, or for several hours (all day). Usable containers include a big ziplock bag or a large bowl covered with plastic wrap.

Grill meat for a short period, it does not take long to grill the thinly sliced beef. Serve and enjoy.

This stuff completely and utterly rules. Eat up!