Gourmet March 1999
Serves 6-8
For mushroom filling:
3 cups water
2 ounces dried porcini mushrooms (about 1 cup)
2 pounds fresh white mushrooms
2 large zucchini (about 1 pound)
1 large onion
3 garlic cloves
5 tablespoons unsalted butter
6 tablespoons Sherry
2 teaspoons chopped fresh thyme leaves
2 1/2 teaspoons salt
1/4 teaspoon freshly ground black pepper
For sauce:
1 stick (1/2 cup) unsalted butter
1/2 cup all-purpose flour
5 cups whole milk
4 1/2 ounces freshly grated Parmesan (about 1 1/2 cups)
2 teaspoons Dijon mustard
1 1/2 teaspoons salt
eighteen 7- by 3 1/2-inch sheets dry no-boil lasagne (about 1 pound)
1/2 pound freshly grated mozzarella (about 2 cups)
1 1/2 ounces freshly grated Parmesan (about 1/2 cup)
Make filling:
In a small saucepan bring water to a boil and remove pan from heat.
Stir in porcini. Soak porcini 20 minutes. Lift out porcini, squeezing out excess liquid, and reserve soaking liquid.
In a sieve rinse porcini to remove any grit and pat dry. Chop porcini and transfer to a large bowl. Simmer reserved soaking liquid until reduced to about 1/4 cup. Pour liquid through a sieve lined with a dampened paper towel into bowl with porcini.
Finely chop white mushrooms. Cut zucchini into 1/4-inch dice. Chop onion and mince garlic.
In a 12-inch heavy skillet heat 3 tablespoons butter over moderate heat until foam subsides and cook white mushrooms with 6 tablespoons Sherry, stirring, until liquid mushrooms give off is evaporated and they begin to brown.
Add mushroom mixture to porcini. (Note: break it into 2 batches if your pan isn't big enough.)
In skillet cook zucchini in 1 tablespoon butter until tender and stir into porcini mixture. In skillet cook onion in remaining tablespoon butter, stirring, until softened. Stir in garlic, thyme, salt, and pepper and cook, stirring, until fragrant, about 30 seconds. Stir onion into mushroom mixture until combined. Filling may be made 1 day ahead and chilled, covered.
Make sauce:
In a 3-quart heavy saucepan melt butter over moderately low heat and whisk in flour. Cook roux, whisking, 3 minutes and whisk in milk. Bring sauce to a boil, whisking constantly, and simmer, whisking occasionally, 3 minutes. Stir in Parmesan, mustard, and salt.
Remove pan from heat and cover surface of sauce with wax paper. Sauce may be made 1 day ahead and chilled, covered. Bring sauce to room temperature before proceeding.
Preheat oven to 375°F. and butter a 13 x 9-inch (3-quart) baking dish.
Assemble lasagne:
Spread 1 1/4 cups sauce in baking dish and cover with 3 pasta sheets, making sure they don't touch each other.
Proceed with spreading one third mushroom filling over pasta sheets in dish and top with 3 more pasta sheets. Top pasta sheets with one third mozzarella.
This is how the layering goes: sauce, 3 pasta sheets, 1/3 cup mushroom filling, 3 pasta sheets and 1/3 of the mozzarella, sauce, 3 pasta sheets, 1/3 cup mushroom filling, 3 pasta sheets and 1/3 of the mozzarella, sauce, 3 pasta sheets, 1/3 cup mushroom filling, 3 pasta sheets and 1/3 of the mozzarella,ending with mozzarella.
Spread remaining sauce over top and sprinkle with Parmesan. On a foil-lined large baking sheet bake lasagne in middle of oven until bubbling and golden, about 45 minutes. Let lasagne stand 20 minutes. Lasagne may be made 1 day ahead and chilled, covered. Bring lasagne to room temperature and reheat before serving.
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