How to Make It
Cook pasta in a large pot of boiling, salted water until almost al dente, 6 to 7 minutes, adding kale during last 10 seconds. Drain, reserving ¾ cup of the pasta water.
Heat oil and garlic in a large skillet over medium, stirring often, until garlic is lightly golden, about 4 minutes. Add pasta and kale, Parmesan, red pepper flakes, and reserved pasta water; cook, tossing, until sauce thickens and coats pasta, about 3 minutes. Season with salt and pepper. Top with pine nuts, ricotta, and lemon zest.