Slow Cooker Korean Beef

Name: Slow Cooker Korean Beef
Ingredients: 1 (3 pound) beef roast, cut into bite sized cubes; 1/4 cup soy sauce (gluten-free for gluten-free); 2 tablespoons brown sugar; 2 tablespoons mirin* (optional); 1 tablespoon honey; 1/4 cup pear (or apple), grated; 1/4 cup onion, grated; 1 tablespoon garlic, minced/grated; 1 tablespoon ginger, minced/grated; 1 tablespoon rice vinegar; 1 tablespoon gochujang* (optional) (gluten-free for gluten-free); 1/4 teaspoon black pepper; 1 tablespoon cornstarch* (optional); 1 tablespoon toasted sesame oil; 1 tablespoon toasted sesame seeds (optional); 2 green onions, sliced (optional)