Classic Rum Cake

A classic rum cake is a dense, moist butter cake soaked in a warm rum syrup that keeps it tender for days. The cake itself is simple, but the syrup transforms it into something rich and boozy that improves as it sits.

Ingredients for Classic Rum Cake

All-purpose flour gives the cake structure and a tender crumb. Baking powder lifts it gently so it stays moist. Salt balances the sweetness. Butter and eggs at room temperature mix into a smooth batter that traps air and rises evenly. Granulated sugar sweetens and helps the butter and eggs cream together. Vanilla extract adds depth. Dark rum in the syrup soaks into the warm cake and keeps it from drying out. Water and brown sugar make the syrup, which caramelizes slightly as it cooks. Chopped walnuts or pecans give texture and a toasted flavor that complements the rum.

Why This Classic Rum Cake Works

Creaming the butter and sugar together traps tiny air bubbles that expand in the oven, making the cake rise and stay light. Adding the eggs one at a time lets each one fully incorporate before the next goes in, so the batter stays smooth and does not separate.

The rum syrup soaks into the warm cake while it is still in the pan, so the heat opens the crumb and lets the liquid soak deep. This keeps the cake moist for several days and lets the rum flavor meld throughout. The brown sugar in the syrup caramelizes slightly as it cooks, adding a subtle depth that plain sugar would not give.

Nuts scattered in the batter and on top add crunch and a toasted flavor that balances the sweetness and the boozy syrup. They also give the eye something to land on.

Mistakes To Avoid

Using cold butter and eggs that are straight from the refrigerator will not blend smoothly into the sugar. The batter will look grainy and separate, and the cake will turn out dense and heavy with a coarse crumb.

Overmixing the batter after you add the flour will make the cake tough and rubbery because the flour develops gluten. Mix on low speed just until the dry ingredients disappear, then stop.

Pouring the hot syrup over a completely cool cake means the syrup sits on top instead of soaking in. The cake will be dry inside and the syrup will pool in the bottom of the pan.

Skipping the fork pokes means the syrup cannot reach the center of the cake. The edges will be soggy while the middle stays dry and bland.

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Ingredients

• 2 cups (250g) all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 1/2 cup (115g) unsalted butter, softened to room temperature
• 1 cup (200g) granulated sugar
• 3 large eggs, room temperature
• 2 teaspoons vanilla extract
• 1/2 cup whole milk
• 1 cup chopped walnuts or pecans
• 1 cup (240ml) dark rum
• 1 cup (240ml) water
• 1/2 cup (100g) packed brown sugar
• 4 tablespoons (60g) unsalted butter

Step-by-step Instructions

1. Heat the oven to 350°F (175°C) and butter a 9-inch round cake pan, then line the bottom with parchment paper.
2. Whisk together the flour, baking powder, and salt in a small bowl and set aside.
3. Beat the softened butter and granulated sugar in a large bowl on medium-high speed for 3 to 4 minutes, until pale and fluffy, scraping the bowl once or twice.
4. Add the eggs one at a time, beating well after each addition until smooth, then beat in the vanilla extract.
5. Add the flour mixture and milk alternately, starting with flour, then milk, then flour again, mixing on low speed just until each addition disappears, about 5 additions total, stopping and scraping the bowl as needed.
6. Fold in the chopped nuts with a spatula until even, then pour the batter into the prepared pan and smooth the top.
7. Bake for 50 to 55 minutes, until a wooden skewer inserted in the center comes out clean or with just a few moist crumbs, and the top is golden brown.
8. While the cake bakes, combine the rum, water, brown sugar, and 4 tablespoons butter in a saucepan and bring to a boil over medium-high heat, stirring until the sugar dissolves, then simmer for 5 minutes and remove from heat.
9. Let the cake cool in the pan for 5 minutes, then use a fork or wooden skewer to poke it all over, about 30 to 40 times, creating small holes throughout the cake.
10. Slowly pour the warm syrup over the warm cake, letting it soak in between pours, until all the syrup is absorbed, then let the cake cool in the pan for 30 minutes.
11. Run a thin knife around the edge of the pan, place a serving plate on top, flip the pan and plate together, and lift off the pan and parchment to unmold the cake.
12. Let the cake cool to room temperature before serving, which allows the flavors to meld and the syrup to set, about 2 hours.