Coarsely chop the chestnuts. Cook the pancetta in 3 tablespoons butter in a large heavy saucepan over moderate heat, stirring, until crisp on the edges, about 5 minutes. Add the onion and garlic, and cook, stirring, until onion is softened. Add the chestnuts and water, and simmer, stirring, until liquid is reduced by 1/2. Discard the garlic clove. Transfer mixture to a bowl and mash to a coarse paste with a fork. Peel 1/2 of the apple and cut enough into 1/4-inch dice to measure 3 tablespoons. Reserve remaining (unpeeled) apple. Stir diced peeled apple into chestnut mixture with Parmesan, parsley, and salt and pepper, to taste. Put 1 won ton wrapper on a work surface, keeping remaining wrappers in plastic wrap, and mound 1 scant tablespoon of filling in center. Lightly brush edges of wrapper with water and top with a second wrapper, pressing down around filling to force out air. Trim excess dough with cutter and seal edges well, pressing them together with your fingertips. Transfer ravioli to a dry kitchen towel, make more in same manner. Cut remaining unpeeled apple into 1/4-inch dice. Toss 3 tablespoons of diced apple with lemon juice. Heat remaining 4 tablespoons butter in a large heavy skillet over moderate heat until foam subsides and butter begins to turn brown. Stir in sage and cook, stirring, until sage is crisp and butter is golden brown. Season with salt and pepper. Add ravioli to a 6-quart pot of salted boiling water, then cook at a slow boil, stirring gently occasionally, until tender, 3 to 5 minutes. Carefully transfer ravioli with a slotted spoon to a colander to drain. Slide ravioli into sage butter and cook over moderate heat, stirring gently for 1 minute. Sprinkle ravioli with remaining diced apple and season with pepper.
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