Start by making croutons. Let the butter melt or the oil get hot. Add the bread and toss gently until coated. Let the bread sit for 2 minutes, then flip the pieces over. Keep tossing and turning until the bread is brown all over. Add oil or butter as needed and sprinkle with salt and pepper. It is basically impossible, unless you are very patient (which I am not) to get every side of the cubes browned, so just get them generally looking good and toasty and then take them off the heat.
To make the dressing, drop the egg yolk into a large mixing bowl. Add the lemon juice, mustard, garlic, and anchovy. Whisk briskly until the dressing is light and frothy. Slowly add the olive oil, whisking the whole time. Once everything is incorporated, add the salt and pepper, then adjust to your taste. I like it very lemony.
Cut the kale leaves to remove the large stem from the center or grab the bottom of the stem and pull the leaves up briskly from the bottom to remove the stem. (Lacinato kale, sometimes called Tuscan kale, has the easiest stems to remove.) Slice the leaves in half lengthwise, then cut into thin ribbons. Chopping the kale into small pieces disguises its tough texture.
Toss the kale in the bowl to coat it with dressing. Set aside for 10 minutes or leave in the fridge for a few hours. The kale will become tender as it marinates.
Before serving, toss in the croutons and top with Romano cheese.