Kale can be fibrous and tough, but you can still enjoy it raw if you know how to tenderize it. Chop or tear the kale leaves then toss with a splash of vinegar or lemon juice and massage the leaves between your fingers for a minute or so. This isn't necessary for baby kale or if you're planning to cook the kale. Another option would be to marinate it in something acidic, such as vinaigrette because this will also make it less chewy. If you're marinating it, you can skip the massage. Also, the smaller you cut the pieces, the less chewing is involved.