Combine Ingredients: In a medium, heavy-bottomed saucepan (use one larger than you think you need, as the sauce will foam up dramatically), combine the butter, sugar, buttermilk, and corn syrup.
Bring to a Boil: Cook over medium heat, stirring constantly, until the butter melts and the sugar dissolves. Bring the mixture to a rolling boil.
Add Baking Soda: Once boiling, remove the pan from the heat and immediately whisk in the baking soda and vanilla extract. Be careful, as the mixture will foam up vigorously.
Serve: The sauce is ready! It will be thin but will thicken slightly as it cools.
Assembly and Serving
· Warm Cake, Warm SAUCE: For the ultimate experience, serve a square of the warm (or room temperature) cake with a generous pour of the warm buttermilk sauce over the top.
· À la Mode: Take it to the next level by adding a scoop of high-quality vanilla ice cream. The combination of warm cake, warm sauce, and cold ice cream is sublime.
Chef’s Tips for Success:
· Room Temperature is Key: Having your butter, eggs, and buttermilk at room temperature ensures they emulsify properly, creating a smooth, well-risen batter.
· Don’t Overmix: Overmixing the batter after adding the flour develops gluten, which can lead to a tough, dense cake. Mix until the last streaks of flour disappear.
· The Foam is Normal: The reaction between the acidic buttermilk and the alkaline baking soda is what creates the incredible foam in the sauce. This is what gives the sauce its unique, airy texture.
· Storage: Store any leftover cake covered at room temperature. The sauce is best served fresh but can be stored in the refrigerator for up to a week. Gently reheat it in the microwave or on the stovetop, adding a splash of buttermilk if it’s too thick.
Enjoy this classic, comforting dessert! It’s a true crowd-pleaser that feels like home.
