I've had sweet potato mash (yummy) and courgette spaghetti for first time really nice might look in to getting a spiraliserI normally use sweet potato, or mixed carrot and swede as a potato replacer. I'm not keen on celeriac. I also use carrot or courgette to make 'spaghetti', I have a spiraliser for that and of course there's cauli for a rice alternative.