Step 1

Remove the flanken ribs from the packaging and pat them dry to remove excess moisture.

Step 2

Place the beef ribs into a shallow dish or container and set this aside.

Step 3

Make the marinade by adding all the ingredients together into a bowl and whisk to combine. Set aside about 1/2 cup and store in a seperate container.

Step 4

Pour over the beef flanken ribs and make sure they are fully coated.

Step 5

Add in the sliced onion and mix everything together, cover with plastic wrap and refrigerate for at least 2 hours or overnight.

Step 6

In a small pot on the stove, cook down the saved 1/2 cup of marinade and let it reduce in half on low heat. Remove from the burner and set aside.

Step 7

Remove the flanken ribs from the marinade and discard the remaining liquid. Pat the flanked ribs dry and prepare them for searing.

Step 8

Heat a large cast iron griddle over medium high heat or heat a grill to medium direct heat.

Step 9

If searing on the cast iron griddle, add a little sesame oil and then sear each side of the flanken ribs for 2-3 minutes. If grilling, add a little oil directly to the beef ribs instead to prevent them from sticking and cook for 2-3 minutes per side as well or until your desired level of doneness (I prefer a medium-rare around 135 F.)

Step 10

When they are cooked, place them on a platter and brush them with the reduced marinade, garnish with sesame seeds and green onions and serve!