Wash the potatoes and cook with the skin in boiling water for about 15 minutes. Peel ginger and chop finely. Wash chillies, carve lengthwise and remove seeds. Then cut into fine rings. Drain potatoes, rinse with cold water, steam a little and peel. Fry them all around in hot oil until golden brown.
Remove from the pan. Sauté the ginger and chilli in the frying fat. Dust with the spices and mix well. Add yoghurt and 6 tablespoons of water. Add the potatoes to the stock and let it simmer at low heat in a closed pot for about 20 minutes. Serve warm or cold