What to do with the celery roots in the fridge? What to do? Ah! got it!
Peel a celery root and slice it into 1/2 cm slices. Steam those until almost tender. Layer the seasoned slices with some good smoked ham. Top the towers with Gruyere and piment d'espelette. Bake at 175C until the cheese is brown and bubbly.
Very simple, but a really good combination of flavors.