1 1/2 pounds fresh pumpkin (peeled and cut into 1-inch cubes, or 1-1/2 cups purée)
2 tablespoons butter
1 1/4 cups unbleached all-purpose flour
1 large egg yolk
1 teaspoon salt
  freshly ground pepper (to taste)
1/2 cup (1 stick) unsalted butter
2 tablespoons fresh thyme leaves
  Shaved parmesan cheese (as garnish)