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Closeup of a chocolate layer cake on table topped with meringue mushrooms.
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Chocolate Rum Cake

Rich chocolate rum cake flavored with vanilla rum and warm spices. A chocolate layer cake decorated with chocolate rum buttercream frosting and meringue mushrooms.
Course Dessert
Cuisine American
Prep Time 1 hour
Cook Time 3 hours
Total Time 4 hours
Servings 8 servings
Author Jenn

Ingredients

Chocolate Rum Cake

  • 2 ¼ cups ( 281 g) Cake Flour
  • 2 teaspoons Baking Powder
  • ½ teaspoon Baking Soda
  • 1 teaspoon Ground Cinnamon
  • ½ teaspoon Ground Nutmeg
  • ¼ teaspoon Ground Cloves 2
  • 1 teaspoon Sea Salt
  • ¾ cup (64 g) Dutch Processed Cocoa Powder
  • 12 tablespoons ( 170 g) Unsalted Butter melted and warm
  • 1 teaspoon Espresso Powder
  • ½ cup (120 g) Blue Chair Bay Vanilla Rum
  • 1 ½ cups (330 g) Dark Brown Sugar
  • ½ cup (120 g) Whole Milk warm
  • 4 Large Eggs room temperature

Chocolate Rum Buttercream Frosting

  • 1 cup (227 g) Unsalted Butter softened
  • ½ cup (43 g) Cocoa Powder
  • ¼ cup (60 g) Blue Chair Bay Vanilla Rum
  • teaspoon sea salt
  • 1 tablespoon Vanilla Extract
  • ¼ cup (60 grams) Heavy Whipping Cream very cold
  • 2 - 2 ½ cups (220- 280 grams) Confectioner's Sugar

Meringue Mushrooms

  • 3 Large Egg White room temperature
  • ¼ teaspoon Cream of Tartar
  • cup (133 g) Granulated Sugar
  • ¼ cup (43 g) Semi Sweet Chocolate melted

Instructions

Chocolate Rum Cake Layers

  • Preheat oven to 350 F (180 C) and prepare three 6-inch round cake pans with non-stick baking spray and layer the bottom with parchment paper.
  • In a large bowl, hand whisk together flours, baking powder, baking soda, salt, cinnamon, nutmeg, and cloves. Set aside.
  • Using a stand mixer fitted with paddle attachment on medium speed, mix the warm melted butter with the brown sugar, Blue Chair Bay Vanilla Rum, sifted cocoa powder, and espresso powder until smooth.
  • Scrape the bottom and sides of the bowl as needed with a rubber spatula to incorporate all ingredients.
  • With the mixer on medium low speed, spoon in a third of the flour mixture, alternating with ½ of the milk. Continuing until both are fully mixed in.
  • Add in the eggs one at a time, mixing on medium speed until batter is smooth.
  • Transfer the cake batter into pans, dividing evenly between them. Place pans on the middle of the oven and bake for 30-35 minutes until toothpick inserted into the center comes out clean or with small crumbs.
  • Set pans on wire cooling rack until completely cooled. Invert layers from pans and wrap in plastic wrap, set in the freezer for 10-15 minutes to firm slightly before icing. (this helps prevent tearing of cake layers during assembly)

Chocolate Rum Buttercream Frosting

  • In the bowl of a stand mixer fitted with whisk attachment whip together softened butter and cocoa powder until fluffy and smooth. (about 3-5 minutes)
  • Mix in Blue Chair Bay Vanilla Rum, sea salt, vanilla extract, and heavy cream until light and fluffy. (about 1-2 minutes)
  • On low speed, add half a cup of powdered sugar at a time, mixing until desired consistency has been reached. Turn up the speed to medium for about 30 seconds to smooth the frosting.
  • Scrape sides and bottom of bowl as needed.
  • To make thicker frosting, mix in a ¼ cup of confectioner's sugar at a time. To make thinner frosting add a tablespoon of heavy cream and mix again.
  • Transfer frosting to a large piping bag fitted with a star piping tip.

Meringue Mushrooms

  • Preheat oven to 200 F (90 C). Line a large baking sheet with parchment paper or a silicone baking mat. For exact measurements, draw small ½-2/3 inch circles on parchment paper. I prefer to just eyeball it and make different sizes for a more natural look.
  • Add the egg whites to the bowl of a stand mixer fitted with whisk attachment. Whip until foamy, about 1 minute. Then, add the cream of tartar and increase to medium high speed for another minute or until soft peaks form.
  • Turn speed down to medium low and slowly pour in the sugar. Increase speed to medium high for 3-4 minutes, whipping until stiff peaks form. The meringue should be thick and glossy.
  • Transfer meringue to a large piping bag fitted with a ¼ inch round piping tip.
  • To pipe the caps, hold the pastry bag upright and close to the parchment paper. With even pressure from the top of the bag, pipe 1.5 inch or similar sized rounds that are about ½ inch high. Dip you fingertip in water and level out any tips.
  • To pipe the stems, hold the pastry bag upright and close to the parchment paper. Using even pressure form the top of the bag, make small cylinders, by gently squeezing the meringue out onto the pan and lifting while releasing pressure. The base of the stem should be the same thickness as the piping tip and get smaller as you lift the bag. You may have a tip and thats ok. I use the tip for assembly.
  • Place pan on the middle rack of the oven and bake for 2 hours. Turn off the oven and let the meringue cool completely. (about 45 minutes) They should be dry and crisp.
  • Melt chocolate in a double broiler or using a microwave safe bowl, heating and stirring in 30 second intervals until smooth.
  • Carve a small hole in the center of the bottom of each mushroom cap. (Make sure not to punch through the dome.) Dip the tips of the stems in melted chocolate and connect the two. If your tips are too pointy, just shave then down to desired levelness.
  • Place mushrooms on a plate while the chocolate sets.

Assemble Cake

  • Remove cake layers from fridge, unwrap and peel away parchment paper.Level cake tops with knife if needed.
  • Place a dollop of buttercream onto cake stand or serving dish.
  • Place bottom cake layer onto dollup. Cover top of cake layer by piping the buttercream in a circular motion starting by piping a ring around the edge and moving towards the center clockwise to mimic tree rings.
  • Add the second cakes layer and repeat with buttercream piping. Flip the final and top cake layer upside down with the flat bottom mow becoming the top of the cake. Pipe with buttercream.
  • Use a small fan brush and dust the meringue mushroom with cocoa powder to mimim dirt.
  • Place mushrooms on top of cake in desired style. If you want to adhere mushrooms to base of cake, use buttercream to help them stick.