7 tablespoons unsalted butter
2 onions
3/4 pound fresh mushrooms
Salt
Freshly-ground black pepper
3 cups mascarpone
3/4 pound Emmentaler
1/4 pound Parmigiano-Reggiano
3 whole eggs
1 1/2 teaspoons freshly-grated nutmeg
8 slices white bread
2 large acorn squash
removed, caps reserved
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