Key Lime Pound Cake

Key lime pound cake is a dense, buttery cake with bright citrus flavor and a tender crumb. The tang of key lime juice and zest cuts through the richness, while a simple glaze adds sweetness and shine. Room-temperature butter creamed with sugar traps air, and the right mixing method keeps the cake tender instead of tough.

Ingredients for Key Lime Pound Cake

Butter creamed with sugar forms the foundation and creates a tender crumb. Granulated sugar sweetens and helps the butter trap air when beaten. Eggs at room temperature blend smoothly and add structure without toughening the cake. All-purpose flour gives body and must be measured by spooning and leveling to avoid density. Key lime juice and key lime zest bring the signature tartness and bright flavor. Whole milk keeps the batter smooth and the cake moist. Baking powder lifts the cake so it rises evenly. Salt balances sweetness and enhances the lime flavor. For the glaze, powdered sugar and more key lime juice create a simple coating that sets firm.

Why This Key Lime Pound Cake Works

Creaming room-temperature butter and sugar for several minutes fills the mixture with tiny air bubbles. When the eggs go in, they blend into these pockets and help set them during baking. This is why the cake rises and stays tender instead of becoming dense.

The flour is stirred in gently and only until the streaks disappear. Overmixing develops gluten and makes the crumb tight and tough. Alternating dry ingredients with milk helps distribute the flour evenly without overworking the batter.

Key lime juice is tart enough to be noticeable but not so much that it curdles the milk or prevents the cake from rising. The zest adds flavor without making the cake dry. A poke test and a toothpick check tell you when the cake is done and still moist inside.

Mistakes To Avoid

Cold butter and eggs do not blend smoothly into the sugar, leaving lumps that bake into dense spots. The batter may look curdled and grainy instead of pale and fluffy. Take the time to bring them to room temperature.

Overmixing the batter after the flour goes in develops gluten and makes the cake tough and dry. Mix only until the streaks of flour disappear. A few lumps are fine and will bake out.

Using too much key lime juice can curdle the milk and prevent the cake from rising evenly. Stick to the measured amount. The flavor will still be bright and clear.

Opening the oven door before the cake is mostly set causes it to sink in the middle. Wait until at least 40 minutes have passed before peeking, and check with a toothpick only when the top looks firm and golden.

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Ingredients

• 1 cup (2 sticks / 226g) unsalted butter, room temperature
• 1 1/2 cups (300g) granulated sugar
• 4 large eggs, room temperature
• 2 cups (240g) all-purpose flour
• 1/4 cup fresh key lime juice
• 2 tablespoons key lime zest
• 1/2 cup whole milk
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon salt
• 1 cup (120g) powdered sugar
• 2 tablespoons fresh key lime juice for glaze

Step-by-step Instructions

1. Heat the oven to 350°F (175°C). Grease a 9×5 loaf pan and line the bottom with parchment paper.
2. In a small bowl, whisk together the flour, baking powder, and salt. In another small bowl, whisk the 1/4 cup key lime juice and key lime zest into the milk.
3. Using an electric mixer on medium speed, beat the butter and sugar together for 3 to 4 minutes, until pale and fluffy, scraping the bowl often.
4. Add the eggs one at a time, beating on medium speed for 30 seconds after each addition, until each egg is fully blended.
5. Reduce the mixer speed to low. Add one-third of the flour mixture, mix until almost combined, then add half of the milk mixture, mix gently, then add half of the remaining flour, mix gently, then the rest of the milk mixture, then the last of the flour. Stop as soon as no streaks of flour remain.
6. Pour the batter into the prepared pan and smooth the top. Bake for 50 to 55 minutes, until a toothpick inserted in the center comes out with only a few moist crumbs and the internal temperature reads 205°F (96°C).
7. Cool the cake in the pan for 15 minutes, then turn it out onto a cooling rack and cool completely, at least 2 hours.
8. Whisk together the powdered sugar and 2 tablespoons key lime juice until smooth. Drizzle over the cooled cake and let it set for 30 minutes before slicing.