Step 1

In a bowl whisk together the soy sauce, Gochujang chili sauce, ginger paste, garlic paste, brown sugar, and sesame oil.

Step 2

Put the flank steak in a dish or gallon size plastic bag. Pour 3/4 of the marinade over the steak and mix until evenly coated. Save the remaining marinade to brush over top during grilling. Marinate the steak at least 1 hour or overnight.

Step 3

Place the steak on a grill over medium high heat for 3-4 minutes per side for medium doneness. Brush with the remaining marinade during grilling.

Step 4

Let the steak rest for a few minutes. Slice the flank steak against the grain and garnish with sesame seeds and green onions if desired. Serve with the optional dipping sauce if desired.