Celery Root Remoulade (Céleri Rémoulade)

I've never liked celery. To me, it's like eating green water held together with a lot of stringy, indigestible fibers. Unless it's filled with peanut butter or cream cheese, you can have it. The only time I ever buy a bunch is when I'm making stock, which is a shame, because I only just need a few stalks and usually the rest sits in my refrigerator until it wilts and dies and I have to throw it out. And I hate throwing food away. A lot of other people in France must feel the same way I do...