Why Bake a Cake with Guinness?
We know what you’re thinking, beer in cake? Stay with us.
Like many things that sound strange at first, it makes a lot more sense once you try it. When Guinness stout is reduced on the stovetop, its roasted malt flavors concentrate and transform into something completely different. Instead of tasting like beer, the reduction develops a deep, rich flavor that leans toward butterscotch, caramel, and dark chocolate. (Note: you can sub the beer for a dark soda like Dr. Pepper or Coke).
That concentrated stout becomes the backbone of this cake, adding depth and moisture that pairs perfectly with cocoa.
We were inspired by several recipes across the internet—from the technical approach of Serious Eats to the decadent versions from Delish—and decided to develop our own version with a focus on precision.
Because when it comes to baking, precision is everything.
Why Temperature Matters for Cake
Many cake recipes rely solely on bake times, but ovens vary, and timing alone rarely guarantees the perfect result.
Instead, we cook this Guinness cake until the internal temperature reaches 206°F (97°C) on our Thermapen ONE.
At this point, the starches in the flour have fully gelatinized, and the crumb structure has set, creating a cake that’s moist, tender, and stable without being underbaked or dry.
Using an instant-read thermometer ensures your cake reaches the exact point where the texture is just right.
Reducing the Guinness
One of the most important steps in this cake happens before the batter is even mixed. We reduce the Guinness stout.
Simmering the beer concentrates its roasted malt sugars and removes excess water. What starts as a bitter stout transforms into a rich syrup with notes of caramel, butterscotch, and dark chocolate that deepen the flavor of the finished cake.
Many recipes simply say to reduce the liquid by half. That sounds easy enough until you realize you are guessing where that halfway point actually is.
This is where your Hi‑Temp Reduction Spatula – Rose Levy Beranbaum Signature Series shines.
Designed in collaboration with legendary baker Rose Levy Beranbaum, the spatula includes high-contrast measurement marks along the blade so you can see exactly how far a liquid has reduced without pouring it into a measuring cup.
To use it, simply insert the spatula into the saucepan when the Guinness first comes to a simmer and note the starting level. As the stout cooks down, the markings show you precisely when the liquid has reached half its original volume.
No guessing. No pouring hot liquid back and forth.
Beyond measuring the reduction, the ultra-thin silicone edge also scrapes every bit of that concentrated stout from the pan and into the batter. The high-temperature silicone is rated to handle hot reductions and bubbling liquids, making it ideal for this step.
It is a small detail, but in a recipe built around precision, scale, and temperature, knowing exactly when your Guinness has reduced by half makes all the difference in flavor and consistency.
Frequently Asked Questions
No. When Guinness stout is reduced and baked into the batter, the alcohol cooks off, and the beer flavor transforms. Instead of tasting like beer, it adds deep notes of chocolate, caramel, and butterscotch that enhance the cocoa in the cake.
Reducing Guinness concentrates its flavor while removing excess water. This creates a richer ingredient that adds depth to the cake without making the batter too thin.
The reduction process intensifies the roasted malt sugars, which helps produce the cake’s signature dark chocolate and caramel flavor profile.
For the best texture, bake this cake until the internal temperature reaches 206°F (97°C).
At this temperature, the starches in the flour fully gelatinize and the crumb structure sets. The result is a cake that is moist, tender, and fully baked without being dry.
Yes. This recipe works well in either:
– Bundt pan
– 9-inch springform pan
Both pans bake evenly and allow the dense chocolate cake to release cleanly when properly prepared with cooking spray and cocoa powder.
Chocolate cakes benefit from cocoa powder instead of flour when dusting the pan. Cocoa prevents sticking while preserving the cake’s dark chocolate exterior, avoiding the white residue that flour can leave behind.
Cream cheese frosting pairs beautifully with this cake.
The tanginess of the cream cheese balances the richness of the chocolate cake, while the white chocolate adds sweetness and structure. The combination creates a smooth frosting that complements the deep malt flavors from the Guinness.
Yes. This cake actually improves after resting.
You can bake the cake one day in advance and store it covered at room temperature. Frost just before serving, or store the frosted cake in the refrigerator and bring it to room temperature before slicing.
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