In a small skillet sweat 1/2 cup pecans and shallots in 1 tablespoon of butter until shallot is tender, about 5 minutes. Let cool. In a small bowl, combine pecan mixture with pumpkin. On a lightly floured surface, spread out 1 pasta sheet. Mound 1 tablespoon pumpkin mixture at 1-inch intervals and top with second pasta sheet; press between mounds of filling to seal, squeezing out air. Use a ravioli wheel to cut into ravioli.

Bring a large pot of salted water to a boil. Drop in ravioli and cook until they float to the surface and are tender, 8 to 10 minutes, depending on their freshness. In a large skillet melt remaining 2 tablespoons butter over low heat. Drain ravioli in a colander, transfer to skillet and toss in butter to coat. Add remaining toasted pecans and parsley. Serve in a warm plate, sprinkled with Parmesan.