Polenta and Spinach Gratin with Gorgonzola and pine nuts

Polenta is as popular in Italy as mashed potatoes are in many other parts of the world. Polenta is made by grinding dried corn into flour or meal. Although it’s usually cooked into a kind of savory porridge, it’s also often used in cookies and cakes. This casserole has two layers of savory polenta around a spinach filling. After topping with Gorgonzola and pine nuts, the dish goes back in the oven for a few minutes, until the cheese melts and bubbles and the pine nuts turn golden and fragra