evidence: Ingredients - 2 bunches asparagus (about 2¼ pounds), bottom ends trimmed - 3 tablespoons unsalted butter - 2 medium yellow onions, chopped - 3 cloves garlic, peeled and smashed - 6 cups low-sodium chicken broth - Salt - Freshly ground black pepper - 2 tablespoons freshly squeezed lemon juice, from one lemon - ½ cup shredded Parmigiano-Reggiano - Handful fresh herbs, such as thyme, dill or basil (optional, for garnish)