What can I do with the white parts of kale? I like to bake, fry, cook and make salads out of dark green parts of the kale. But when I get to the middle of the kale, I don't like those whiteish bright parts, just not tasty much imo.

I was thinking about blending it in a smoothie but I don't have a blender yet.

Any ideas how to prepare those?
Just like the tougher parts of any brassica plant (e.g. broccoli), chop the stems as thinly as required and add to a stir fry dish. they typically take as long as carrots take to "cook" in the wok

Properly grown kale with a decent frost exposure, should have a softer stems with a sweeter and more flavourful taste