This vegan cashew and celery stir-fry, which is adapted from “Tenderheart” by Hetty Lui McKinnon (Alfred A. Knopf, 2023), offers a lovely jumble of textures that form a dish that is uncomplicated but elegant. Celery is an ingredient that performs well in stir-fries, as it perfumes the entire dish and delivers a gratifying, crisp-tender crunch. You can use any leafy greens in this dish, but if they have thick stems (like gai lan), make sure you cut them in half lengthwise, which will help them cook quickly and evenly. Cashews add a creamy nuttiness, and tofu provides substance — but you could opt for shiitake mushrooms in its stead.