Place the sugar in a heavy 10-inch skillet which is ovenproof. Cook the sugar over medium heat until it melts and becomes a light brown syrup. Remove from the heat and add the butter, stirring until melted.
Arrange the apples in a layer, rounded side down, in the sugar syrup. Make a second layer, rounded side up, fitting the pieces between the pieces between the pieces in the first layer. Fill any remaining pieces with apple pieces. Mix together the lemon juice and grated zest. Sprinkle it over the apples.
Prepare the pie crust mix according to package directions. On a lightly floured surface, roll the pastry to make a 10-in circle. Place the pastry circle over the apples.
Bake for 25-30 minutes, or until the crust is golden brown. Invert the tart onto a shallow serving dish. Serve warm and garnish with whipped cream.
Graland Country Day School is a private school in Denver, Colorado, serving students in preschool, kindergarten, elementary, and middle school. Founded in Denver in 1924, Graland incorporates a rich, experiential learning approach in a traditional classroom setting, emphasizing the development of globally and socially conscious leaders who excel academically.