Wash the potatoes well. Cook for about 20 minutes. Peel and finely chop the ginger. Clean, core, wash and finely chop the chilli
Quench the potatoes, peel them. Fry in hot oil until golden brown all around. Sweat curry, cumin, ginger and chilli briefly and salt. Stir in 6 tablespoons of water and yoghurt and warm it up carefully (do not boil, yoghurt flocculates!). Remove from the heat and let it stand for at least 30 minutes. Serve warm or cold