Preheat the oven to 200°C fan/220°C/Gas mark 7.
Mix the celeriac, onion and salt together in a bowl and allow to sit for 10 minutes.
Transfer onto a clean tea towel and squeeze out the excess water.
Place the cutter on a lined baking tray and fill with a quarter of the mixture and then remove the cutter. Repeat 4 times.
Bake for 10 minutes or until golden brown.
This recipe has been specifically designed for a low protein diet. Refer to labels for allergen and other product information.