I first baked this Lemon Rhubarb Loaf on a rainy spring afternoon and it immediately became the cake I reach for when rhubarb is at the farmer’s market. Bright lemon, tart pockets of rhubarb, and a tender crumb make it a perfect spring brunch cake or afternoon treat with tea. If you like tart-sweet loaf cakes with a homey feel, you might also enjoy my apple cinnamon swirl loaf as a spice-forward alternative.
Why you’ll love this dish
This loaf balances sharp lemon flavor with the fresh tartness of rhubarb, so it feels lighter than a heavy butter cake. It’s straightforward to make with pantry staples and only one bowl for the wet ingredients, which keeps cleanup minimal. Make it for a weekend brunch, a potluck, or when you want a simple dessert that still feels seasonal and special. Kids often like the bright taste and adults appreciate the sophisticated contrast between sweet glaze and tangy fruit.
Step-by-step overview
You’ll mix softened butter and sugar, add eggs, then fold in lemon and dry ingredients. Gently fold chopped rhubarb into the batter, bake the loaf until a toothpick comes out clean, cool, and finish with a lemon glaze. The whole process is mostly hands-off while the oven does the work, and the glaze is mixed in minutes once the loaf is cool.
What you’ll need
- 1/2 cup unsalted butter, softened (room temperature)
- 1 cup granulated sugar
- 1 1/2 cups all-purpose flour
- 1/2 teaspoon baking powder
- 1/2 teaspoon baking soda
- 2 large eggs, room temperature
- 1/4 cup fresh lemon juice
- Zest of 1 lemon
- 1 cup rhubarb, chopped into 1/2-inch pieces
- 1 cup powdered sugar
- 2 to 3 tablespoons lemon juice for the glaze
Ingredient notes and substitutions:
- Butter gives the best flavor and crumb. For a dairy-free option, use a neutral-tasting oil (like light olive oil or vegetable oil) but reduce to 1/3 cup and add 1 tablespoon applesauce for structure.
- If your rhubarb is very tart, you can toss it with a tablespoon of sugar and let it sit 10 minutes, then drain excess liquid before folding into the batter.
- Use freshly squeezed lemon juice for brightest flavor; bottled juice will work but will be less vibrant.
Step-by-step instructions
- Preheat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan and set it aside.
- In a mixing bowl, cream the softened butter and granulated sugar until light and fluffy. This aerates the batter for a tender loaf.
- Add the eggs one at a time, beating well after each addition so the mixture stays smooth.
- Stir in the lemon juice and lemon zest until evenly combined.
- In a separate bowl, whisk the flour, baking powder, and baking soda together to distribute the leavening evenly.
- Gradually fold the dry ingredients into the wet mixture until just combined. Do not overmix; stop when you see no more streaks of flour.
- Gently fold in the chopped rhubarb so it is evenly distributed but the batter stays airy.
- Pour the batter into the prepared pan and smooth the top with a spatula.
- Bake for 50 to 60 minutes, until a toothpick inserted in the center comes out clean or with a few moist crumbs.
- Let the loaf cool in the pan for about 10 minutes, then turn it onto a wire rack to cool completely.
- For the glaze, whisk the powdered sugar with 2 to 3 tablespoons of lemon juice until smooth. Drizzle over the cooled loaf and let it set before slicing.
Best ways to enjoy it
Serve slices at room temperature so the crumb is tender and the glaze has set. This loaf is lovely with a cup of breakfast tea, a mild coffee, or alongside plain yogurt and fresh berries for brunch. For a more decadent dessert presentation, top slices with a spoonful of whipped cream and a few thin lemon slices or reserved roasted rhubarb.
Storage and reheating tips
Store the glazed loaf at room temperature in an airtight container for up to 2 days. To keep it longer, refrigerate for up to 5 days; cover loosely with plastic wrap to prevent the glaze from picking up fridge odors. For longer storage, wrap the unglazed loaf tightly in plastic wrap and aluminum foil and freeze up to 3 months. Thaw overnight in the refrigerator or at room temperature, then add glaze before serving. Slice and reheat individual pieces in a microwave for 10 to 15 seconds if you prefer a warm slice.
Helpful cooking tips
- Use room temperature eggs and butter so they emulsify easily and the batter rises evenly.
- Chop rhubarb into consistent 1/2-inch pieces to avoid large watery pockets and to ensure even distribution.
- If your loaf is browning too quickly, tent it loosely with foil after 30 to 35 minutes.
- To test doneness, insert a toothpick near the center; a few moist crumbs are fine but it should not be wet batter.
- Let the loaf cool completely before glazing; warm glaze will melt and run off, creating a thin coating instead of a glossy finish.
For another loaf technique and inspiration on swirl patterns, see this apple cinnamon swirl loaf.
Flavor swaps
- Berry swap: Replace rhubarb with 1 cup halved strawberries or raspberries for a sweeter, perfumed loaf.
- Citrus twist: Add 1/2 teaspoon vanilla and swap half the lemon juice for orange juice for a different citrus profile.
- Nutty crunch: Fold in 1/3 cup chopped toasted almonds or pistachios for texture and a nutty contrast.
- Gluten-free: Substitute a 1:1 gluten-free baking flour blend and add 1/4 teaspoon xanthan gum if your blend lacks it.
Common questions
How long does it take to make this loaf from start to finish?
Active prep time is about 20 minutes. Baking takes 50 to 60 minutes, plus cooling time of at least 30 minutes before glazing and slicing. Plan for roughly 1 hour 45 minutes total so the loaf cools properly.
Can I use frozen rhubarb?
Yes. Thaw frozen rhubarb and drain excess liquid before folding it into the batter to avoid a soggy loaf. Pat it dry with paper towels if needed.
My loaf sank in the middle. What went wrong?
Common causes are underbaking, opening the oven door too early, or too much leavening. Make sure the center reaches doneness with a toothpick and avoid opening the oven in the first 30 minutes. Measure baking powder and baking soda accurately.
Can I add other fruits with the rhubarb?
Yes. Strawberries pair beautifully with rhubarb; use up to 3/4 cup chopped strawberries with 3/4 cup rhubarb. Avoid very juicy fruits unless they are patted dry.
How tart will this be — can I reduce the lemon?
The recipe has a noticeable lemon brightness but is not overwhelmingly tart thanks to the sugar and glaze. Reduce the lemon juice to 2 tablespoons in the batter if you prefer a milder lemon presence, but keep the zest for aroma.
Lemon Rhubarb Loaf
Ingredients
Method
- Preheat the oven to 350°F (175°C). Grease a 9x5-inch loaf pan and set it aside.
- In a mixing bowl, cream the softened butter and granulated sugar until light and fluffy.
- Add the eggs one at a time, beating well after each addition.
- Stir in the lemon juice and lemon zest until evenly combined.
- In a separate bowl, whisk the flour, baking powder, and baking soda together.
- Gradually fold the dry ingredients into the wet mixture until just combined.
- Gently fold in the chopped rhubarb.
- Pour the batter into the prepared pan and smooth the top with a spatula.
- Bake for 50 to 60 minutes, until a toothpick comes out clean.
- Let the loaf cool in the pan for about 10 minutes, then turn it onto a wire rack to cool completely.
- For the glaze, whisk the powdered sugar with 2 to 3 tablespoons of lemon juice until smooth.
- Drizzle over the cooled loaf and let it set before slicing.
