Place the cereal, turmeric and salt in a saucepan, add water and stir. Put on the fire and bring to a boil.
Reduce heat and cook the cereal for 7 minutes on low heat, stirring occasionally. As soon as the liquid begins to evaporate, begin stirring the cereal constantly and continue cooking for another 10 minutes.
Remove the saucepan from the heat and add the butter. Smooth the surface of the porridge, cover with a lid and leave to cool at room temperature.
Turn the cooled mamalyga over onto a plate.