01 -
Heat the oven to 350 degrees F. Stir the graham crumbs, sugar, salt, and melted butter until evenly moistened. Press firmly into a 9-inch pie plate and bake for 8-10 minutes, then cool completely.
02 -
Combine strawberries, 1 tablespoon sugar, and 1 teaspoon lemon juice in a small saucepan. Cook over medium heat for 4-5 minutes until syrupy, then puree until smooth and cool.
03 -
Combine blueberries, the remaining 1 tablespoon sugar, and remaining 1 teaspoon lemon juice in the saucepan. Cook for 4-5 minutes until the berries burst, then puree until smooth and cool.
04 -
Beat the softened cream cheese, powdered sugar, sour cream, and vanilla until smooth with no lumps. In a separate bowl, whip the cold heavy cream to stiff peaks.
05 -
Fold the whipped cream into the cream cheese mixture in two additions. Use a spatula and gentle strokes so the filling stays light.
06 -
Spread half the filling into the cooled crust. Add small dollops of both berry purees, then top with the remaining filling and more puree. Drag a skewer through the top in light curves to marble the colors.
07 -
Cover and refrigerate for at least 6 hours, or overnight. Slice cold with a hot, wiped knife for the cleanest wedges.