Cut asparagus into 1–2 inch pieces. Heat a skillet until hot, then add the asparagus. Char for a few minutes until golden in spots and tender-crisp. Lower the heat and sprinkle with salt.
Boil the tortellini according to the package directions. Before draining, reserve about ¼ cup of the pasta water for the sauce.
Add the butter and lemon-infused olive oil to the skillet with asparagus. Once melted, stir in the lemon juice and a touch of zest. Let the flavors come together over medium heat.
Add the cooked tortellini to the skillet. Gently toss to coat in the lemon butter sauce. If needed, add a splash of the reserved pasta water to help the sauce cling.
Stir in the toasted pine nuts and walnuts. Season everything generously with salt and black pepper.
Serve immediately, topped with fresh Parmesan and an optional drizzle of lemon olive oil. Enjoy it solo, or with a crisp salad and a glass of wine.