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1
When the polenta is fresh and hot, slosh the mold with cold water so its damp.
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2
Pour in the polenta and level it to form a smooth disk at least 1 1/2 inches thick.
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3
Chill until solidified, then invert the mold to get out the disk (wrap and refrigerate it for up to 2 days if you want).
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4
Heat the oven to 400 when you are ready to make the cake.
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5
Slice the disk into three equal round layers (as you would split a cake layer).
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6
Place one round on a well-buttered or parchmentlined baking sheet.
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7
Dot the surface, lightly or heavily, with bits of butter, using a third of the total, then with half the gorgonzola and a third of the grated Parmigiano-Reggiano.
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8
Place a second polenta layer on the fillings and load it up the same way, using up the gorgonzola.
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9
Top with the third polenta round and decorate it with butter and Parmigiano-Reggiano.
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10
Put the sheet in the oven and bake for 30 minutesor 45 if the polenta is just out of the fridgeuntil the top of the cake is sizzling and deep golden and the filling oozes from between the layers.
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11
Lift with a wide spatula onto a cake plate.
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12
Serve very hot.
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13
You might want to bake some halved, cored pears alongside the polenta cake to serve with it.
