Whisk the soy sauce, sherry, honey , garlic, onion, sesame oil, sesame seeds, cayenne and black pepper in a bowl.
Add the Flanken ribs to a large plastic resealable bag and pour in sauce. Seal and massage marinade into ribs. Let sit in the fridge for a minimum 3 hours or overnight.
Grill over medium-high heat, brushing with marinade while cooking. About 4-5 minutes per side.
Garnish with more sesame seeds and sliced green onion. Serve with rice or noodles.
Notes
Like things a little spicier? Double the amount of cayenne!Store leftovers in a tightly sealed container in the fridge for up to 3 days.