Place a large pot of generously salted water over high heat. Bring to a boil and add kale leaves. Cook for 1 minute.
Using tongs, remove kale leaves from boiling water and place in blender. Save roughly 1 cup of cooking liquid.
Next, add garlic, lemon juice, walnuts, parmesan cheese, olive oil, salt and pepper to the blender and process until smooth. (Use reserved cooking liquid if needed to smooth it out).