Fennel
Even though I'm an adventurous cook I've never tried celeriac.
Just don't like the look of it - is it hard to peel and chop?
My usual beef stew includes lots of butter beans, presoaked. Plus tinned baked beans in tomato sauce.
I've got other recipes with dried fruit - prunes, apricots etc.
And beer.
Celeriac looks a bit difficult Fennel but it really isn't and is worth it!
With a large sharp knife top & tail so you have a firm base - the bottom can be rooty and gnarly. Then with a good vegetable knife cut down the skin from top to bottom, and work your way around, rather like if you were tackling a pineapple.
Then cut into 1" or so dice and roast with a splash of olive oil, just like potatoes - really delicious
I roasted one yesterday and this portion was left over and I'll have with lunch - just reheat in the microwave.