Drain the cooled greens and squeeze out as much excess water as possible using your hands, a cheesecloth, or a clean dish towel. Transfer the greens to a high-speed blender along with the chives, basil, parsley, garlic, ricotta, parmesan, lemon zest, lemon juice, salt, and pepper. Do not blend yet—wait until the pasta water is ready (or use broth if prepping in advance).