Hello, welcome to the forum
I agree the double barrel cakes are beautiful. But using an 8” x 3” pan will produces an extraordinary amount of cake. In cake alone that’s 8 - 1 1/2” layers! Double barrel cakes are usually bake for events. And 2” deep pans are usually used.
If this cake is just for your family a 6” barrel made with 6 layers would be a better choice.
But if you want to stick with an 8” cake, I recommend you purchase two plain untreated aluminum 8 x 2“ cake pans.
Three inch deep pans are problematic for a number of reasons, including the problems with even baking given the volume of batter.
Also, most recipes are scaled for the standard cake pan is 2” deep pan. There’s a math formula for scaling the recipe up. But you can’t use it with a recipe in volume measurement. If you want to know the formula I can post it for you.
Below are links to recipes on King Arthur Flour’s website. I selected these recipes because overall they are pretty dependable.
Another reason is you can select the type of measurement. As a new baker I assume you bake by volume and not weight. The site allows you to select volume, metric, or US measurements.
Lastly, since your pan dimensions are in inches, I assume you’re American. There’s a marked difference between American and European flours. So A recipe formulated with European flour will not necessarily reproduce well with American flour.
Here are a few tips to achieve good results.
Read through the entire recipe before you begin. As obvious as that seems many people neglect to read through a recipe. To avoid mistakes it’s important you understand each step
in the process before you begin.
Use the ingredients as listed and follow the directions exactly the first time you use a recipe. If a recipe calls for whole milk, use whole milk. Baking is all science. It’s based on the ratio of all the ingredients, fats, sugar, eggs, liquid, against the flour. Something as simple as changing the percentage of fat in the milk actually changes the ratio of the fat to flour in the whole recipe.
Measure out all your ingredients and prepare your pans before you begin mixing.
If you do not own an oven thermometer I would strongly encourage you to purchase one. You have to think of temperature as an ingredient. Cake is a result of chemical reactions. The chemical reactions does not occur with out heat. And not just any heat. The right amount of heat, for the right amount of time is critical for the success of a cake. So temperature is very much an ingredient.
Understand your pan. Is it untreated natural metal? Is it anodized aluminum? Is it non-stick? It dark metal?
Untreated natural metal is the best baking surface for cake. If your pan is anodized aluminum, non-stick, or dark metal you must reduce the oven temperature by 15° – 25°. And you may have to adjust your bake time. Those types of pan conduct heat much more intensely than a natural untreated metal. So they will inhibit rise, over bake the bottom and edges, cause the top to dome and crack, and produce a dry cake.
Temperature can also cause a cake to dome. To prevent doming, wrap the cake pan with strips of wet cloth. Wilton sells them but you can make your own. See link below.
The correct way to test a cake for doneness is to insert a instant read thermometer into the cake. Toothpick test can be very wrong. And if you are going to use those 3” deep pans it is even more critical you test by temperature.
For a butter cake, The internal temperature should be between 205° – 210°. Do not let the cake go to 212°. At sea level water boils at 212°. If the cake temperature reaches boiling, too much moisture will evaporate and the cake will be very dry.
Barrel cakes are not single cakes. They are in fact two 4” layer cakes staked.
For a double barrel you will need a total of eight layers.
So bake four 8” x 2” cakes. Then slice each cake in half to create the eight layers.
The cake must properly supported and stack to create the illusion of a single tall cake. Below is a link for a tutorial on supporting and stacking a double barrel cake.
Chocolate Cake
https://www.kingarthurflour.com/recipes/favorite-fudge-birthday-cake-recipe
Vanilla Cake
https://www.kingarthurflour.com/recipes/tender-white-cake-recipe
Cloth baking strips
http://thulascakelab.com/2016/07/16/diy-bake-even-strips/
How to support and stack a double barrel cake
I swear by cloth strips. My cakes always bake level with them.
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