Boil the potatoes in their skins, then peel and dice into small cubes. Chop the onion and chillis finely, then crush the garlic and fry in butter with the spices, seasoning and potatoes. Fry well till dry. Mash the mixture with a fork and when cool divide into six equal portions. Divide the paratha dough into six portions, roll each portion into a ball and flatten it in the palm of the hand. Put a portion of the potato mixture in the centre, fold the dough over to cover and re-shape into a ball. Roll out on a pastry board as thinly as possible. Cook as for paratha.
Note: Preparation time 35 minutes, Cooking time 1 hour, To serve 4