Use fresh, crisp vegetables and avoid overcooking to maintain a nice crunch. The combination of soy, hoisin, and oyster sauces is key to the signature flavor. Prep all ingredients before cooking as stir-frying goes quickly. Customize by adding your favorite proteins or swapping vegetables. For a vegan version, use vegetarian oyster sauce and verify vegan-friendly hoisin and soy sauces. Leftovers keep well refrigerated for up to 3 days and freeze for up to 2 months.