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1
Adjust oven rack to middle position and heat to 400 degrees.
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2
Melt butter in a 9-by-13-inch pan in the preheating oven until nutty golden. Sprinkle brown sugar evenly over butter in the pan, then place pears, cut sides down, over sugar.
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3
Bake until pears are tender when poked with a sharp knife and sauce is thick and caramel colored, about 40 minutes. Remove pears from sauce to a plate with a slotted spoon. Pour sauce in a measuring cup. (You should have about 1 cup of sauce. If not, simmer to reduce, or add water to equal 1 cup.) Cool pears and sauce to room temperature. (At this point, you can remove skin from the pears with a knife, if you want.) Cut each pear half into 8 chunks.
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4
When ready to assemble, whip cream into soft peaks, gradually adding sugar. Beat in 2 Tbs. of brandy. Set aside.
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5
Place 24 gingersnaps on a cookie sheet and lightly brush with some of the brandy. Work quickly; the cookies will soften in places, making them difficult to transfer. Arrange 3 cookies in each of 8 goblets. Drizzle each with some of the caramel sauce (about 1/3 cup total), a dollop of whipped cream and 4 pieces of pear.
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6
Lightly brush remaining 16 cookies with brandy and repeat layering with 2 cookies, 1/3 cup caramel sauce, whipped cream and 4 pieces of pear. Drizzle with remaining 1/3 cup caramel sauce, and cover each goblet with plastic wrap. Refrigerate parfaits and remaining whipped cream until serving time.
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7
To serve, garnish each goblet with a dollop of whipped cream and top with a couple slivers of candied ginger.