Tart Slab Pie is a delightful and indulgent dessert that brings together the classic flavors of chocolate and marshmallow in a buttery, flaky pie crust. This dessert is a fun and delicious twist on traditional pies, with its rectangular shape and layers of rich chocolate filling and fluffy marshmallow fluff. Perfect for sharing with friends and family, Tart Slab Pie is a true crowd-pleaser that will satisfy anyone with a sweet tooth.

The history of Tart Slab Pie is not as well-documented as some other classic desserts, but it is believed to have evolved from various pie and pastry traditions. The concept of slab pies likely originated from the need to feed larger groups or gatherings, such as family reunions or community events. Instead of making individual pies, bakers started creating larger, rectangular pies that could be easily cut into serving portions for a crowd.

The use of a rectangular or slab-shaped pan allows for a different presentation and cutting style, making it convenient for serving at social events. As for the combination of chocolate and marshmallow, this delicious pairing has been a beloved treat for decades, inspiring classic desserts like s’mores.

Tart Slab Pie combines the nostalgia of traditional pies with a modern twist, making it a popular dessert choice for parties, celebrations, or even casual gatherings. With its luscious chocolate filling, fluffy marshmallow fluff, and buttery crust, this pie is a delightful treat that brings joy to those who indulge in its deliciousness.

INGREDIENTS

FOR THE CRUST:

• 7 ½ cups all-purpose flour
• 6 tablespoons granulated sugar
• 1 teaspoon kosher salt
• 1 1/3 cups unsalted butter, cold, cut into pieces
• 1 1/3 cups shortening, cold
• 1 1/3 cups ice water
• 4 teaspoons distilled white vinegar

FOR THE CHOCOLATE FILLING AND GLAZE:

• ¾ cup granulated sugar
• ½ cup light corn syrup
• ¼ cup water
• 1/8 teaspoon kosher salt
• 2 large egg whites, at room temperature
• ¼ teaspoon cream of tartar
• 1 ½ teaspoons vanilla extract
• ¼ cup unsweetened cocoa powder
• 1/3 cup heavy cream
• 2/3 cup dark chocolate, chopped
• 2 tablespoons granulated sugar
• 1 tablespoon butter, cubed
• A pinch kosher salt
• 4 graham crackers, crushed
• 1 egg + 1 tablespoon water, lightly beaten
• ½ cup powdered sugar
• 3 tablespoons cocoa powder
• ½ cup heavy cream

INSTRUCTIONS

1. Whisk together the flour, sugar, and salt in a large bowl or the bowl of your food processor. Add in the chopped pieces of cold butter and cold shortening and blend together until you have coarse crumbs.
2. Mix together the water and vinegar in a small bowl. Slowly drizzle it over the dough, a tablespoon at a time, gently stirring the mixture until fully incorporated. Form the dough into loose balls, wrap tightly in plastic wrap, and chill in the fridge for a minimum of 3 hours or as long as overnight.
3. Prepare the chocolate filling and fluff by following the instructions provided in the recipe. Set them aside.
4. Preheat your oven to 400 degrees F and generously butter a 9×13-inch baking sheet.
5. Roll out the first ball of dough into a rectangle and place it into the baking sheet. Spread the chocolate mixture over the dough, followed by the marshmallow fluff and crushed graham crackers.
6. Roll out the second pie crust and place it over the top. Crimp the edges together and use a fork to make a pattern on the top.
7. Brush the top of the pie with the egg and water mixture. Bake the pie until golden brown and shiny on top.
8. Allow the pie to cool slightly, then spread the glaze over the top. Let the pie cool completely before serving.

Enjoy this delightful Tart Slab Pie, a modern twist on classic flavors that is sure to impress and delight anyone who tries it! Perfect for sharing and savoring the rich and sweet combination of chocolate and marshmallow in every bite.