Slow Cooker Korean Beef

Name: Slow Cooker Korean Beef
Prep time: 15 min
Cook time: 6 h
Total time: 6 h
Yield: 6
Ingredients: Ingredients; 3 lbs beef chuck roast or beef short ribs, cut into 2-inch pieces; 1 large onion, thinly sliced; 4 cloves garlic, minced; 1 tablespoon fresh ginger, grated; 2 Asian pears or 1 regular pear, grated; 4 green onions, chopped (reserve some for garnish); 2 tablespoons sesame seeds; 2 tablespoons vegetable oil (for searing, optional); Cooked white or brown rice for serving; Fresh cilantro for garnish (optional); Korean Sauce; 1/2 cup soy sauce (low sodium preferred); 1/4 cup brown sugar; 3 tablespoons rice wine vinegar; 2 tablespoons gochujang (Korean chili paste); 2 tablespoons sesame oil; 1 tablespoon honey; 1 teaspoon ground black pepper; 1/4 teaspoon red pepper flakes (optional, for extra heat)