Preheat oven to 450°F.

Cut the celeriac into ¼-inch strips (like French fries), and place them in an ovenproof dish.

Drizzle with olive oil, and season with sea salt and freshly ground black pepper if desired.

Bake the fries for approximately 10 minutes.

After 10 minutes, decrease the temperature to 400°F for another 8–10 minutes.