Mongolian Beef - Pinch Of Nom

Ingredients

• 400g beef sirloin, cut into thin strips
• 2 tbsp vegetable oil
• 3 cloves garlic, minced
• 1 red capsicum, sliced
• 1 yellow capsicum, sliced
• 1 small onion, thinly sliced
• 1 cup mushrooms, sliced
• 2 tbsp soy sauce
• 2 tbsp oyster sauce
• 1 tbsp hoisin sauce
• 1 tsp sesame oil
• 1 tsp chilli flakes (optional)
• 2 tbsp cornflour mixed with 2 tbsp water