Yes to about all your questions. Here's one recipe & at the link below you'll find lots more.
CELERY KNOB PARMIGIANA (serves 6)
4 celery knobs
1 TBL lemon juice
2 tsp salt
6 TBL butter,melted
1/2 cup grated Parmesan
2 TBL chopped parsley

Preheat oven to 425°. Peel the celery knobs & cut them into thin little sticks about 2"long. Drop the pieces into boiling water to cover with the lemon juice & salt added. Cook about 10 minutes or until just tender. Do not overcook. Drain.
butter a baking dish large enough to hold the celery knobs. Arrange a layer of the drained pieces & sprinkle w/some of the melted butter & some of the cheese. Continue to fill the dish with drained pieces, butter & cheese. Continue to fill the dish with drained pieces, butter & cheese. If desired, each layer may be sprinkled with a little black pepper & paprika.
Bake 15 minutes or until the cheese is golden brown. Sprinkle a border of parsley around the edge & serve the celery knobs in the baking dish.~~Craig Claiborne

Here is a link that might be useful: Celeriac Recipes

Thanks for the info, Ginger. I'm probably going to get around to using it tomorrow.

I like it roasted. I peel it and cut into cubes then toss with olive oil and seasonings with other veggies and roast as you would normally.

I like it. It has a slight celery flavour and an interesting texture.