Rice vinegar – apple cider vinegar or champagne vinegar are good alternatives here.Brown sugar – use a combination of white sugar and molasses to make your own brown sugar.Soy sauce – tamari or coconut aminos can be used in place of soy sauce.Hoisin sauce – sweet soy sauce (known as kecap manis) will provide a similar taste but garlic teriyaki, oyster sauce and bean pasta are other good substitutes.Chicken breasts – chicken breasts are the leaner option but diced chicken thighs would be a great alternative.Cornstarch – you can also use potato starch or rice flour to thicken the sauce.