Korean Bulgogi Bowl
1 cucumber, diced 1 cup cooked brown rice, or more to taste 1 head romaine lettuce, chopped, or to taste 1 inch piece ginger, peeled and diced 1 pound lean ground beef 1 red bell pepper, diced, or to taste 1 tablespoon sesame oil 1 tablespoon sesame seeds, or to taste 1 teaspoon red pepper flakes 5 cloves garlic, minced, or more to taste ¼ cup brown sugar ¼ cup soy sauce ¼ cup water ½ Asian pear, grated ½ teaspoon ground black pepper