* Preheat oven 350 F (175 C). Spread 2 - 3 tablespoons of tomato sauce on the bottom of an oven pan.
* Place the polenta slices in the pan.
* Cover uniformly with tomato sauce.
* Top with the fontina cheese. Finish with grated parmigiano reggiano. Repeat with an additional layer if you like. Place in the oven for about 15 - 20 minutes until the cheese melts. Serve hot.