From NYTimes
Ingredients
3 pounds short ribs, cut in 1/2-inch slices across the bones (flanken-style)
1.Rinse short ribs in cold water, pat dry and place in a wide shallow bowl. In another bowl, mix together soy sauce, brown sugar, rice wine, sesame oil, black pepper and cayenne.
2.Put onion, garlic, pear and ginger in the work bowl of a food processor. Grind ingredients to a smooth purée, then add to soy sauce mixture. Add sesame seeds. Thin with ¼ cup water. Pour marinade over short ribs and mix well. Cover and refrigerate for at least 2 hours, or overnight. Bring to room temperature, drain and discard marinade.
3.Cook short ribs on a hot grill or under the broiler for 2 to 3 minutes per side, until nicely browned but juicy. Pile grilled meat on a platter and serve immediately with lettuce leaves on the side. Accompany with sliced hot peppers, ssamjang and steamed rice, if desired.YIELD About 20 slices, 4 to 6 servings.