Sizzling Beef Pepper Steak: Easy Weeknight Winner!

Ingredients

• 1 lb (450g) sirloin steak, cut into thin strips
• 1 tablespoon soy sauce (low sodium)
• 1 tablespoon dry sherry (or rice wine vinegar)
• 1 teaspoon cornstarch (cornflour)
• 1/2 teaspoon ground black pepper
• 1/2 teaspoon vegetable oil
• 2 tablespoons vegetable oil, divided
• 1 large onion, thinly sliced
• 1 red bell pepper, seeded and cut into strips
• 1 green bell pepper, seeded and cut into strips
• 2 cloves garlic, minced
• 1 tablespoon fresh ginger, minced
• 1/2 cup (120ml) beef broth (low sodium)
• 2 tablespoons soy sauce (low sodium)
• 1 tablespoon oyster sauce (optional)
• 1 tablespoon brown sugar
• 1 tablespoon cornstarch (cornflour), dissolved in 2 tablespoons cold water
• Sesame oil (for drizzling, optional)
• Chopped scallions (green onions), for garnish