1. Toss cucumbers and a pinch of salt together in a small bowl; let sit 5 minutes. Heat a 14" wok (or stainless-steel skillet) over high heat until it begins to smoke. Add 1 tbsp. oil around edge of wok; swirl to coat bottom and sides. Add carrots and onions; cook until softened, about 1 minute. Transfer to a plate; set aside.