Preheat the oven to 230°C/gas 8/fan 210°C. Remove the rough skin from the celeriac by slicing off the top and bottom and brushing along the sides with a heavy, sharp knife. Celeriac should be cut into thumb-thick slices, then fat chips.
STEP 2
Bring a big pot of salted water to a boil, then add the chips and blanch (boil rapidly, uncovered, for 1-2 minutes). Drain the chips and return them to the pot. Combine the oil, curry powder, and sea salt in a mixing bowl. Toss until well coated.
STEP 3
Leave lots of room between the chips on a wide heavy baking sheet (you may need 2 sheets). Cook for around 30-35 minutes in the oven.