Bake the Ultimate Zesty Lemon Rhubarb Loaf Cake This Spring

Welcome the warmer weather with this incredibly moist and bright Zesty Lemon Rhubarb Loaf Cake. Combining the sweet-tart flavor of fresh rhubarb with a vibrant burst of lemon zest, this loaf is perfect for afternoon tea or a delightful weekend brunch. The simple glaze seals in the moisture, making every slice irresistible.

Why You Will Love This Recipe

This Zesty Lemon Rhubarb Loaf Cake is the epitome of spring baking. You will absolutely adore how easy it is to whip up, yet it delivers gourmet flavor and a perfectly tender crumb. The combination of tart rhubarb suspended in the bright, lemony cake base is refreshing, not overly sweet, and the crackly lemon glaze adds the perfect textural contrast. It’s a fantastic way to use up that beautiful spring rhubarb harvest.

Ingredients

• 1 1/2 cups all-purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1 cup granulated sugar, divided
• Zest of 2 large lemons
• 1/2 cup (1 stick) unsalted butter, softened
• 2 large eggs
• 1 teaspoon pure vanilla extract
• 1/2 cup buttermilk (or whole milk mixed with 1/2 tsp lemon juice)
• 1 1/2 cups chopped fresh or frozen rhubarb (cut into 1/2 inch pieces)
• 1/2 cup powdered sugar (for glaze)
• 1 tablespoon fresh lemon juice (for glaze)

Step-by-Step Instructions

1. Preheat your oven to 350°F (175°C). Grease and flour a standard 9×5 inch loaf pan, or line it with parchment paper, leaving an overhang for easy removal.
2. In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
3. In a large bowl, combine the granulated sugar and the lemon zest. Rub the zest into the sugar with your fingertips until the sugar is fragrant and slightly wet. This releases maximum lemon flavor.
4. Add the softened butter to the lemon sugar mixture and beat with an electric mixer until light and fluffy, about 2-3 minutes.
5. Beat in the eggs one at a time, ensuring each is fully incorporated before adding the next. Stir in the vanilla extract.
6. Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk, mixing on low speed until just combined. Be careful not to overmix the batter.
7. In a small bowl, gently toss the chopped rhubarb with 1 tablespoon of the flour mixture (this helps prevent the rhubarb from sinking to the bottom of the cake).
8. Gently fold the coated rhubarb into the batter using a spatula.
9. Pour the batter evenly into the prepared loaf pan.
10. Bake for 50 to 65 minutes, or until a wooden skewer inserted into the center comes out clean or with just a few moist crumbs attached. If the top browns too quickly, loosely tent it with aluminum foil after about 40 minutes.
11. Let the cake cool in the pan for 15 minutes before carefully transferring it to a wire rack to cool completely.
12. While the cake cools, prepare the glaze: Whisk together the powdered sugar and lemon juice until smooth. Add another teaspoon of lemon juice if the glaze is too thick.
13. Drizzle the cooled loaf cake generously with the lemon glaze. Let the glaze set before slicing and serving your Zesty Lemon Rhubarb Loaf Cake.

Expert Tips / Pro Tips

To ensure your cake is perfectly moist and flavorful, follow these professional tips. Always use room temperature ingredients, especially butter, eggs, and buttermilk, as they emulsify better, creating a superior cake structure. Don’t skip rubbing the zest into the sugar; this is crucial for extracting the aromatic oils for that intense lemon flavor. When handling rhubarb, tossing it lightly in flour before folding it in prevents the fruit from sinking during baking. Finally, avoid opening the oven door frequently, especially during the first 40 minutes, as the sudden temperature drop can cause the center of your loaf to sink.

Variations & Substitutions

For those looking to modify this classic, there are plenty of options. If you don’t have fresh rhubarb, feel free to substitute it with an equal amount of frozen rhubarb (do not thaw first, but ensure you cut it into small pieces). You can incorporate other spring berries, such as sliced strawberries, blending them with the rhubarb for a mixed fruit loaf. For a richer flavor, substitute half of the all-purpose flour with almond flour. If buttermilk is unavailable, combine milk with a teaspoon of white vinegar or lemon juice and let it sit for five minutes before using.

Serving Suggestions

This Zesty Lemon Rhubarb Loaf Cake shines on its own, but it pairs beautifully with an array of accompaniments. Serve a warm slice with a generous dollop of freshly whipped cream or a scoop of vanilla bean ice cream for dessert. For a brunch setting, it is delightful served alongside strong black coffee or a light herbal tea. A smear of good quality lemon curd on the side also enhances the overall citrus experience.

Storage, Freezing & Reheating

This loaf cake stores remarkably well due to its moisture content. Store the loaf, tightly wrapped in plastic wrap and then foil, at room temperature for up to 4 days. If you need longer storage, the unfrosted loaf freezes beautifully. Wrap the cooled, unglazed loaf tightly in plastic wrap followed by heavy-duty aluminum foil. Freeze for up to 3 months. To reheat, thaw overnight in the refrigerator. If you wish to serve it warm, slice what you need and microwave individual pieces for 10-15 seconds. If freezing glazed, ensure the glaze is fully set first.

Nutrition Information

The following table provides estimated nutritional information for a single serving (assuming 12 slices). This is an approximation and actual values will vary based on ingredient brands and exact measurements used.

FAQ

Can I make this loaf cake without buttermilk?

Yes, you can easily substitute buttermilk. Add 1/2 teaspoon of white vinegar or lemon juice to 1/2 cup of whole milk. Let it sit for five minutes until it slightly curdles, and then use it in place of buttermilk.

Why is my rhubarb sinking to the bottom of the cake?

Rhubarb is heavy and moist, which naturally causes it to sink. To prevent this, ensure you lightly toss the chopped rhubarb pieces with about 1 tablespoon of the dry flour mixture from the recipe before gently folding them into the wet batter. This light coating helps it suspend evenly.

How do I know when the Zesty Lemon Rhubarb Loaf Cake is fully baked?

The most reliable test is the toothpick test. Insert a thin wooden skewer or toothpick into the very center of the loaf. If it comes out clean or with just a few moist crumbs attached, the cake is done. If wet batter clings to the skewer, continue baking for 5-minute intervals.

Zesty Lemon Rhubarb Loaf Cake

A delightful, moist loaf cake bursting with tart rhubarb and bright lemon zest, topped with a sweet lemon glaze. Perfect for afternoon tea or brunch.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 15 minutes mins

Servings: 8 slices

Course: Dessert, Snack

Cuisine: American, Baking

Calories: 310

Ingredients Method Notes

Ingredients

  

For the Loaf Cake

• 1 1/2 cups All-purpose flour
• 1 teaspoon Baking powder
• 1/2 teaspoon Salt
• 1 cup Granulated sugar Plus 2 tablespoons for rhubarb
• 1/2 cup Unsalted butter Softened
• 2 large Eggs
• 1/4 cup Milk Whole milk recommended
• 2 teaspoons Lemon zest From about 2 lemons
• 2 tablespoons Fresh lemon juice
• 1 cup Rhubarb Chopped into 1/2 inch pieces

For the Lemon Glaze

• 1 cup Powdered sugar
• 2 tablespoons Fresh lemon juice

Method

 

Instructions

1. Preheat your oven to 350°F (175°C). Grease and flour a standard 9×5 inch loaf pan, or line it with parchment paper.
2. In a small bowl, toss the chopped rhubarb with 2 tablespoons of granulated sugar. Set aside.
3. In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
4. In a large mixing bowl, cream together the softened butter and 1 cup of granulated sugar until light and fluffy (about 3 minutes). Beat in the eggs one at a time, ensuring each is fully incorporated. Stir in the lemon zest and 2 tablespoons of lemon juice.
5. Alternately add the dry ingredients and the milk to the wet ingredients, beginning and ending with the dry mixture. Mix until just combined; do not overmix.
6. Gently fold in the sugared rhubarb pieces. Pour the batter into the prepared loaf pan and spread evenly.
7. Bake for 50 to 55 minutes, or until a wooden skewer inserted into the center comes out clean. Let the cake cool in the pan for 10 minutes before carefully turning it out onto a wire rack to cool completely.
8. While the cake cools, prepare the glaze: Whisk together the powdered sugar and 2 tablespoons of lemon juice until smooth and pourable. If the glaze is too thick, add a few drops more juice; if too thin, add a bit more powdered sugar.
9. Once the loaf is completely cool, drizzle the lemon glaze evenly over the top. Allow the glaze to set before slicing and serving.

Notes

For an extra flavorful crumb, use finely grated lemon zest mixed with the sugar before creaming the butter. Ensure all cold ingredients (eggs, milk) are at room temperature for the best batter emulsification.