1 Granny Smith apple, peeled for grating over pasta
Bring 4 quarts water to boil in stock pot (8 qut). Add 1 Tbsp salt and pasta, stir to separate, and cook until al dente. Drain and return to pot.
While pasta is cooking, heat 2 Tbsp oil in large nonstick skillet or saute pan over high heat until beginning to smoke. Add asparagus, pepper, and remaining 1/2 tsp salt; cook without stirring, until asparagus begins to brown, about 1 min.
Add walnuts and continue to cook, stirring frequently, until asparagus is tender-crisp and nuts are roasted, about 4 min. Toss in greens until wilted.
Add asparagus mixture, cheese, vinegar, and remaining 3 Tbsp oil to pasta in stock pot; toss to combine. Serve immediately, grating apple over individual servings.
Serves 5-6 Total Cook Time: 15 min.
Cooks Illustrated Mar/Apr 2003