Mix yoghurt and sauce. Wash the meat, dab dry and mix with the sauce. Cover and chill for at least 2 hours.
Heat the oil in a coated pan. Drain the fillets in portions, season with salt and pepper and fry in the hot oil. Place on a baking tray. In a preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see
manufacturer) Fry for 15-20 minutes. Cut into slices to serve.