In a small bowl, whisk the hoisin sauce, soy sauce, rice wine vinegar, brown sugar, and cornstarch. Set it aside to use later.
oast the cashews until golden brown. Add the onion and garlic to the wok, add the veggies. Add the stir fry sauce and toasted cashews to the wok.
A simple side of white rice absorbs all the tangy sauce and delivers it to your mouth! Any type of rice works great, so just use your favorite style.