Our Cooking Video to make a Stir Fry with Secret Sauce Teriyaki Sauce. A common question: 'How can one get crisp vegetables when making a stir fry?' Well, the main tricks in a successful stir fry are: high heat, all ingredients are ready to use immediately, full attention, and thickening (if you choose to do so). It also must be served immediately and can't be lying around as the vegetables will start wilting... in a manner of speech.