Onions are peeled. Left whole if they are small and are cut into quarters if they are large.
In a pot add water to heat. It is a boil. Onions are added. It brings back to a boil and cooked 2 minutes. Are removed from the later and drain well.
The oven is preheated to 375 F.
Meanwhile, prepare a sauce by putting the milk in a pot, are you stirred the flour, pepper, salt and nutmeg and, heat, stirring constantly with a wire whisk, Cook until boiling and thickened, a few 5 minutes. He retired from the fire. Stir you the 1/2 Cup Parmesan cheese and drained onions are stirred him.
Moves everything to a glass mold to bake some 25 centimeters in diameter for a few 4 depth. Are you sprayed over the 2 tablespoons grated cheese. The mold gets into the oven and Bake until golden brown, a few 25 minutes. Removed mold from the oven and let stand a few minutes.
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