Presoak a medium-sized or large clay pot, top and bottom, in water for 15 minutes.
Grind the mushrooms and onion fine in a meat grinder, then place in a saucepan, add the butter, and simmer for 5 minutes. Add the flour, blend well, and pour into the presoaked pot. In a bowl, combine the milk, garlic, bay leaves, salt, and pepper, and pour into the pot.
Cover the pot and place it in a cold oven.
Serve with the Parmesan cheese.
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