Step 2
Set a wok over high heat and add vegetable oil. When oil is hot, add asparagus and season lightly with salt. Stir-fry for a minute or so, then add Sichuan pepper, five-spice powder, garlic, ginger, sugar, chiles, soy sauce and walnuts. Continue cooking over high heat for 1 to 2 minutes, tossing to coat well, until asparagus is cooked but still firm and bright green. (It will continue to cook a bit off the heat.)