Massaging kale is always a good idea, but it’s not a must when you’re chopping it into fine pieces. It’s a tough and fibrous leafy green, so massaging with a bit of oil and a bit of lemon juice helps to break down the fibers, tenderizes it so it is easier to chew and digest. Again, because you’re chopping it finely and it’s going to be baked, it is up to you if you would like to or not.