Wok and Roll: Mongolian Beef Stir-Fry that Packs a Flavorful Punch!

Ingredients

• 2 tablespoons brown sugar
• 4 cloves garlic, minced
• 1 lb (450g) flank steak, thinly sliced
• ¼ cup soy sauce
• 2 teaspoons sesame oil
• ¼ cup cornstarch
• 2 green onions, sliced
• 2 tablespoons hoisin sauce
• Sesame seeds, for garnish (optional)
• Steamed rice, for serving
• 2 tablespoons vegetable oil
• 2 tablespoons oyster sauce
• 1inch piece of ginger, grated
• 2 tablespoons rice vinegar
• 1 teaspoon red pepper flakes (optional)