Wash the potatoes well and boil them for 10 minutes with turmeric and curry.
While the potatoes are boiling, mix the ingredients for the sauce in a bowl.
Strain the potatoes and put them in a baking pan. Press them lightly with a fork or with the puree press. Pour over the sauce and stir well (ideally by hand) to cover all the potatoes. If you want, add 1-2 sprigs of fresh rosemary in the pan. Bake in a preheated oven at 150°C/302°F, for about an hour or until golden brown, depending on how crispy you want them.