Simple, quick, and deliciously perfumed by the smoky flavor of a well-seasoned wok, this is my go-to lunch in Thailand, and I definitely prefer it made with fresh rice noodles instead of dried. Fresh noodles don’t need water to cook; hence, they pick up better wok flavor (“wok breath”) and have far better texture. When selecting fresh noodles, make sure you choose the thin and chewy ones, which are often mixed with tapioca, rather than the thick Chinese soft rolls.
“Wok breath” refers to the deep smokiness that a well-seasoned wok imparts to food. Dry noodle dishes such as pad si ew are especially enhanced by this flavor. It’s important to preheat your wok well so that the food hits the hot wok with a sizzle, and you have to keep the wok moving constantly to prevent the food from overcooking while giving it enough time to pick up the wok breath. But make sure the wok isn’t so smoking hot that the oil burns as soon as you pour it into the pan—the smell of burning oil is hugely undesirable and adds unwanted bitterness to your food.