Pat the short ribs dry and sprinkle black pepper on all sides.
Heat 2 to 3 tablespoons of sesame oil to a large Dutch oven or skillet. Sear the short ribs on all sides and remove and place in a slow cooker.
Mix soy sauce, sugar, vinegar, ginger, garlic, and red pepper in a small bowl. Whisk and pour over the seared short ribs in the slow cooker.
Cover and cook on high for 4 hours or on low for 6-8 hours. Remove ribs from crockpot and serve hot over a bed of rice with a garnish of green onions and sesame seeds.
Mix soy sauce, sugar, vinegar, ginger, garlic, and red pepper in a small bowl. Place ribs in a 5-quart slow cooker and pour the sauce over the ribs. Cover and cook on high for 4 hours or on low for 6-8 hours.
Remove the ribs from the slow cooker. Serve hot over a bed of rice or noodles with extra sauce poured over them. Garnish with green onions and sesame seeds.