Bring the stock and milk to the boil, stir in the maize, reduce the heat and cook for approx. 10 mins, stirring continuously to form a thick paste, season. Using a wide spatula, spread the polenta onto the back of an oven tray approx. 28 x 36 cm that has been rinsed in cold water. Allow polenta to cool, cut into three 7 cm squares.
Heat the oil in a frying pan, add the chicory, stir fry for approx. 10 mins. until tender, add the honey and vinegar, season with salt and simmer for approx. 10 mins.
Place the polenta slices, radicchio and gorgonzola into the greased dish in alternate layers and sprinkle with the hazelnuts. Gratinate for approx. 10 mins. in the upper half of an oven preheated to 200°C.