You can use pork tenderloin cut into strips, in place of chicken for this recipe. The oyster sauce is optional but I add it in to mostly all of my stir-frys for added taste, if you have some add in a couple of tablespoons towards the end it will really "perk" up stir-fry dish!. We prefer our veggies crisp, if you like a softer texture, then you can steam the veggies first if you wish before stir-frying them. Serve the is cooked rice.