Sticky Mongolian Meatballs

Ingredients

• 1/2 cup panko breadcrumbs
• 1/2 cup green onions, thinly sliced, plus more, to taste, for serving
• 1/2 teaspoon salt
• 1/4 teaspoon white pepper
• 1 pound ground beef
• 1 large egg
• 1 tablespoon garlic, minced
• 1 tablespoon low-sodium soy sauce
• 1/4 teaspoon red pepper flakes
• 1/2 cup water
• 1/3 cup brown sugar
• 1/4 cup low-sodium soy sauce
• 4 cloves garlic, grated
• 2 teaspoons sesame oil
• 2 teaspoons ginger, grated
• 1 tablespoon oyster sauce
• 1 tablespoon hoisin sauce
• 1/8 teaspoon red pepper flakes
• 1/8 teaspoon white pepper
• 2 teaspoons sesame seeds, toasted