BereidingsadviesServings for 4 people. Heat a litre of salted water in a saucepan or a copper pot. Just before the water boils, sprinkle in 250g of Agnesi polenta, stirring firmly and carefully to avoid clumping. Continue cooking over a law heat for about 50 minutes, stirring gently and always in the same direction. The polenta will be cooked when it begins to flake at the edges. Preparation can also be done in the oven, cooking the pre-mixed polenta in boiling salted water an hour at 220 °C.