Preheat the oven to 375 degrees F.
In a large bowl, toss the apples with the melted butter and 1 tablespoon of the sugar.
In a bowl fitted with an electric mixer, combine 1/2 cup sugar and eggs. Beat until pale and creamy, about 5 minutes. Add the creme fraiche and 2 teaspoons Calvados and beat for 1 minute.
Decoratively arrange the apples evenly over the bottom of the baked tart shell. Pour the cream mixture over the apples and spread to the edges. Bake until the cream is set and the apples are tender, 50 minutes to 1 hour.
Remove and cool on a wire rack for at least 1 hour.
In a medium bowl, beat the heavy cream until soft peaks start to form. Add 2 teaspoons of confectioners' sugar and the remaining tablespoon of Calvados and beat until stiff peaks start to form. Transfer to a decorative bowl.
Remove the tart from the pastry mold. Place on a platter, dust with confectioners' sugar, and serve with the Calvados whipped cream.
Yield: 8 servings