Wash and spin dry your lettuces. Same with the kale. Trust me, a salad spinner is a must. Then shred the kale thinly—as thinly as you can. Massage the kale a little to make it more absorbent for the dressing. Mix in a bowl with torn lettuces, sprinkle with salt, and toss with your hands. Don’t be afraid to get your hands in a salad.