For an even more intense pistachio flavor, lightly toast the pistachio nuts before grinding. Be careful not to burn them! Shaving the asparagus helps it cook more evenly and allows the pistachio crust to adhere better. A wire rack allows air to circulate, ensuring a crispier crust. If you don't have a wire rack, you can bake the asparagus directly on the baking sheet, but the crust may not be as uniformly crisp. Serve immediately for the best texture and flavor.