I used Korean Beef Galbi marinade out of a bottle with an extra tsp of pureed garlic
You could make a fresh marinade sauce Korean / Asian style
6 Tbsp soy sauce
2 Tbsp brown sugar
2 Tbsp rice wine
1 medium onion grated
1 Tbsp minced garlic
1 red apple grated
1 tsp minced ginger
1/2 tsp ground black pepper
To make it easier chuck all the ingredients into a blender and whiz up done
Put meat in a bag and throw all the marinade in and cover turn over after a couple of hours