Heat oven to 200C/180C fan/gas 6. Peel the potatoes and cut into large chunks or, if they are small enough, keep them whole. Place in a pan of salted water, add most of the turmeric, stir and bring to the boil. Turn down the heat and simmer the potatoes for 6 mins until the sides are fluffy. Drain well and leave to cool slightly. Mix the flour, polenta, paprika and remaining turmeric together in a large bowl, then toss through the potatoes until evenly coated in the flour mix.