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Have you checked the valves ? See FAQ. Peel and chop the turnips and potatoes and chop the onion. Put 30 g butter in the pressure cooker and sweat the onion without browning, add the turnips and potatoes, pour in the water and season. Close the lid. As soon as the steam is released, reduce the heat source and leave it to cook for the indicated time. During cooking, check that the valve murmurs regularly. Open the pressure cooker and blend in the food processor. Beat in the rest of the butter.