Celery, Par-cel, Celery leaf and Celeriac

I like celery as a background flavour, and for the crunch in seafood mixes. Celery stalks are apparently calorie negative, as it takes more calories to crunch and chew a celery stalk than there is calories in it. That doesn't make me like it better. But it's nice cooked.

I prefer celeriac, but I've never successfully grown that. Maybe next year will be it
I've got par-cel seeds too, and will try that next year