The Texas BBQ-Joint Chocolate Sheet Cake
Chapter 5 — Drinks & Sweets
A cake sits on a partitioned styrofoam plate, the boiled frosting shatters where a flimsy plastic fork hits it. The secret is immediate heat: you bloom cocoa in boiling butter, and pour molten fudge icing over the cake the exact second it leaves the heat. The result is a crackly, sugary sheath over a dense, fudgy core that perfectly cuts through a pound of fatty meat. Pour the icing while the sponge is still hot, and serve it from a dented half-sheet pan.
Before you start
Prepare the baking vessel.
Lightly grease a 13x18-inch rimmed half-sheet pan (jelly roll pan) with butter or non-stick spray.
Ingredients
- all-purpose flour2 cup
- granulated sugar2 cup
- baking soda1 tsp
- kosher salt1/2 tsp
- unsalted butter1 cup
- water or hot brewed coffee1 cup
- natural unsweetened cocoa powder1/3 cup
- large eggs2 large
- full-fat buttermilk1/2 cup
- vanilla extract1 tsp
- unsalted butter1/2 cup
- whole milk1/3 cup
- natural unsweetened cocoa powder1/3 cup
- powdered sugar3 1/2 cup
- vanilla extract1 tsp
- Texas pecans1 cup
- smoked flaky sea salt1 pinch
Method
- 01
Fire up the pit or the oven to 350°F.
If you’re running a pellet smoker, load it with applewood or pecan and set it to 350°F. For a kettle grill, build a two-zone indirect fire using the snake method, tossing a single chunk of applewood onto the lit coals. Stuck indoors? A standard 350°F kitchen oven works just fine—we'll fake the smoke later.
- 02
Whisk the dry ingredients together.
In a large mixing bowl, combine the flour, granulated sugar, baking soda, and kosher salt.
- 03
Bloom the cocoa in boiling butter.
In a medium saucepan over medium-high heat, combine 1 cup of butter, the water (or coffee), and 1/3 cup cocoa powder. Bring it to a rapid boil, whisking constantly to hydrate the starches and wake up those dormant chocolate aromatics.
- 04
Marry the boiling cocoa with the dry mixture.
The moment it boils, pull it from the heat and pour the molten liquid directly over your flour mixture. Stir gently with a spatula until just combined. The batter will be thick and heavy.
- 05
Bind the batter with buttermilk and eggs.
In a separate small bowl, whisk the buttermilk, beaten eggs, and 1 teaspoon of vanilla. Pour this into the heavy chocolate batter and whisk until it thins out into a smooth, pourable consistency. Transfer it to your greased half-sheet pan, tapping it once on the counter to evict any air bubbles.
- 06
Bake the cake until it springs back.
Place the pan in your oven or on the indirect side of your smoker. Bake for 18 to 22 minutes. You're looking for an internal temperature around 200°F, or until a toothpick inserted into the center comes out clean.
- 07
Build the hot fudge icing while the cake bakes.
Timing is everything here. With five minutes left on the bake, rinse out your saucepan and simmer the remaining 1/2 cup butter, milk, and 1/3 cup cocoa powder. Pull it from the heat, aggressively whisk in the powdered sugar and vanilla until glossy and lump-free, then fold in the toasted pecans.
- 08
Pour the boiling icing over the hot cake and let it rest.
The exact second the cake leaves the heat, pour the steaming icing directly over it, coaxing it to the edges with a rubber spatula. Do not cut it yet. Let it sit at room temperature for at least an hour so the hot icing seeps into the crumb, forming a fudgy barrier and a crackly crust.
- 09
Slice it in the pan and serve.
No elegant plating required here—just slice it into humble squares directly in the sheet pan. If you baked this indoors, hit it with a tiny pinch of smoked sea salt right before serving to mimic that backyard barbecue aroma. When your guests take a bite, they should close their eyes and say, 'Yes, this is exactly what the end of the line at Franklin tastes like.'
Notes
Respect the rest period.
Just like a brisket needs to rest in a cooler, this cake requires at least an hour on the counter. Cutting into it too early ruins the structural magic of the icing.
From Cook BBQ at Home.