Delicious Rhubarb Loaf Cake

I used to think rhubarb was only good for pie. Growing up, that’s all I ever saw my mom make with it. She’d come back from the farmers market with armfuls of those pink stalks, and we knew what was coming. Don’t get me wrong—I love a good rhubarb pie. But sometimes you want something a little easier, something you can slice and wrap up for lunch boxes or grab with your coffee.

That’s where this loaf cake comes in. It’s simpler than pie—no rolling out dough or crimping edges. You just mix everything in one bowl, fold in the rhubarb, and let your oven do the work. The brown sugar keeps it moist, and the ginger adds just enough warmth without taking over. Plus, it uses up rhubarb when you’ve got it growing faster than you can keep up with.

Make it on Sunday, and you’ll have breakfast sorted for half the week. Or do what I do and eat a slice while it’s still warm from the oven.

What Kind of Rhubarb Should I Use?

Fresh rhubarb is always your best bet for this loaf cake, and you’ll find it in grocery stores during spring and early summer when it’s in season. The color of the stalks doesn’t really matter – whether you get bright red, pink, or greenish stalks, they’ll all taste pretty similar and work just fine in baked goods. Just make sure to trim off any leaves if they’re still attached, since those are actually toxic and shouldn’t be eaten. If fresh rhubarb isn’t available, you can use frozen rhubarb instead – just thaw it first and drain off any excess liquid so your batter doesn’t get too watery.

Options for Substitutions

This rhubarb loaf is pretty forgiving when it comes to swaps, so here are some options:

• Rhubarb: Fresh rhubarb works best, but if you only have frozen, that’s totally fine. Just thaw it completely and drain off any excess liquid before using it, or your cake might turn out too wet.
• Butter: You can swap butter for margarine or a neutral oil like vegetable or canola oil (use about 140 ml). The texture will be slightly different but still tasty.
• Brown sugar: Regular white sugar works if that’s what you have. You’ll lose a bit of that caramel-like depth, but the cake will still be sweet and good.
• Vanilla essence: Vanilla extract is the same thing, just use the same amount. If you don’t have either, you can skip it or add a bit of almond extract instead.
• Ginger: Ground ginger can be swapped with cinnamon or nutmeg if you prefer. Fresh grated ginger works too – use about 1 tablespoon for a stronger kick.
• Flour: All-purpose flour is what you need here – don’t substitute with self-rising flour as it already contains leavening agents that could throw off the recipe.

Watch Out for These Mistakes While Baking

The biggest mistake when making rhubarb loaf cake is skipping the pre-baking step for the rhubarb, which releases excess moisture that can make your cake dense and soggy – those 20 minutes in the oven are worth it. Another common error is over-mixing the batter once you add the eggs, which develops too much gluten and creates a tough, chewy texture instead of a tender crumb, so mix just until combined. Don’t forget to cover the top with foil after 40 minutes like the recipe says, otherwise the surface will brown too quickly while the center stays undercooked. Finally, resist the urge to slice into the cake right away – letting it cool completely helps it firm up and makes cleaner slices that won’t fall apart on your plate.

What to Serve With Rhubarb Loaf Cake?

This rhubarb loaf cake is perfect for afternoon tea or coffee time, and it’s even better with a dollop of whipped cream or vanilla ice cream on the side. The tangy rhubarb pairs really nicely with a hot cup of tea or coffee, which balances out the sweetness of the cake. I also love serving it for brunch alongside some fresh berries and yogurt, or you can toast a slice the next day and spread a little butter on it for breakfast. If you want to get fancy, a drizzle of honey or a dusting of powdered sugar on top makes it feel extra special.

Storage Instructions

Store: This rhubarb loaf cake actually gets better after a day or two as the flavors meld together. Keep it wrapped in plastic wrap or in an airtight container at room temperature for up to 3 days, or in the fridge for up to a week if your kitchen is warm.

Freeze: You can freeze the whole loaf or individual slices for up to 3 months. Just wrap it tightly in plastic wrap, then in foil to prevent freezer burn. I like to slice it first so I can grab a piece whenever I want without thawing the whole thing.

Serve: Let frozen slices thaw at room temperature for about an hour, or pop them in the microwave for 20-30 seconds if you’re in a hurry. The cake is delicious served at room temperature or slightly warmed with a little butter spread on top.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 3050-3200
• Protein: 28-32 g
• Fat: 140-150 g
• Carbohydrates: 420-440 g

Ingredients

For the rhubarb:

• 12 oz rhubarb (cut into 1-inch lengths)
• 2.25 tbsp brown sugar

For the batter:

• 9 oz flour (I always use King Arthur all-purpose flour)
• 6.5 oz butter (softened to room temperature, about 70°F)
• 6.5 oz brown sugar
• 2 large eggs (at room temperature)
• 1.25 tsp vanilla
• 1 tsp ginger (freshly ground preferred for more flavor)
• 1/4 tsp salt

Step 1: Prepare the Rhubarb

• 12 oz rhubarb, cut into 1-inch lengths
• 2.25 tbsp brown sugar

Cut the rhubarb into 1-inch lengths and place in a small baking dish.

Toss with 2.25 tablespoons of brown sugar.

Roast at 350°F (180°C) for 20 minutes until the rhubarb is softened but still holds its shape.

This pre-cooking removes excess moisture from the rhubarb and concentrates its tart flavor, which prevents the loaf from becoming soggy.

Remove from the oven and let cool while you prepare the batter.

Step 2: Create the Butter and Sugar Base

• 6.5 oz butter, softened to room temperature
• 6.5 oz brown sugar

In a large mixing bowl, combine the softened butter (70°F is important so it creams properly) with 6.5 oz brown sugar.

Beat together for 2-3 minutes until the mixture becomes light, fluffy, and pale—this incorporates air that helps the cake rise.

I find that starting with butter at room temperature makes this step much faster and gives a better crumb structure.

Step 3: Add Eggs and Incorporate Dry Ingredients

• butter and sugar mixture from Step 2
• 2 large eggs, at room temperature
• 1.25 tsp vanilla
• 1 tsp ginger, freshly ground
• 9 oz flour
• 1/4 tsp salt

Add the room-temperature eggs one at a time to the butter-sugar mixture from Step 2, beating well after each addition until fully incorporated.

Stir in the vanilla and freshly ground ginger, then add the flour and salt.

Mix until just combined—don’t overmix, as this develops gluten and makes the crumb dense rather than tender.

Overmixing is the most common mistake in loaf cakes, so stop as soon you don’t see streaks of flour.

Step 4: Assemble and Top the Loaf

• batter from Step 3
• cooled rhubarb from Step 1

Reserve about 1/3 of the cooled rhubarb from Step 1 for topping.

Fold the remaining rhubarb gently into the batter from Step 3, being careful not to crush the pieces.

Transfer the batter to a parchment-lined loaf tin (approximately 8×4 inches or 9×5 inches), spreading it evenly.

Arrange the reserved rhubarb pieces on top in a single layer, pressing them gently into the batter so they stay in place during baking.

Step 5: Bake the Loaf with Foil Protection

Bake at 350°F (180°C) for 40 minutes uncovered, then tent the top loosely with foil to prevent the rhubarb and top from browning too quickly.

Continue baking for 30-35 minutes more (1 hour 10-15 minutes total) until a toothpick inserted into the center comes out clean or with just a few moist crumbs.

The foil prevents over-browning while allowing the interior to bake through completely.

Step 6: Cool and Serve

Let the loaf cool in the tin for 5 minutes, then turn it out onto a wire rack to cool completely.

This prevents the bottom from becoming soggy from steam condensation.

Slice and serve warm or at room temperature with custard, cream, or alongside a cup of tea.

Delicious Rhubarb Loaf Cake

Delicious Delicious Rhubarb Loaf Cake recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 40 minutes mins

Cook Time 1 hour hr 25 minutes mins

Total Time 2 hours hrs 5 minutes mins

Servings: 8 slices

Calories: 3125

Ingredients Method

Ingredients

  

For the rhubarb

• 12 oz rhubarb (cut into 1-inch lengths)
• 2.25 tbsp brown sugar

For the batter

• 9 oz flour (I always use King Arthur all-purpose flour)
• 6.5 oz butter (softened to room temperature, about 70°F)
• 6.5 oz brown sugar
• 2 large eggs (at room temperature)
• 1.25 tsp vanilla
• 1 tsp ginger (freshly ground preferred for more flavor)
• 1/4 tsp salt

Method

 

1. Cut the rhubarb into 1-inch lengths and place in a small baking dish. Toss with 2.25 tablespoons of brown sugar. Roast at 350°F (180°C) for 20 minutes until the rhubarb is softened but still holds its shape. This pre-cooking removes excess moisture from the rhubarb and concentrates its tart flavor, which prevents the loaf from becoming soggy. Remove from the oven and let cool while you prepare the batter.
2. In a large mixing bowl, combine the softened butter (70°F is important so it creams properly) with 6.5 oz brown sugar. Beat together for 2-3 minutes until the mixture becomes light, fluffy, and pale—this incorporates air that helps the cake rise. I find that starting with butter at room temperature makes this step much faster and gives a better crumb structure.
3. Add the room-temperature eggs one at a time to the butter-sugar mixture from Step 2, beating well after each addition until fully incorporated. Stir in the vanilla and freshly ground ginger, then add the flour and salt. Mix until just combined—don't overmix, as this develops gluten and makes the crumb dense rather than tender. Overmixing is the most common mistake in loaf cakes, so stop as soon you don't see streaks of flour.
4. Reserve about 1/3 of the cooled rhubarb from Step 1 for topping. Fold the remaining rhubarb gently into the batter from Step 3, being careful not to crush the pieces. Transfer the batter to a parchment-lined loaf tin (approximately 8x4 inches or 9x5 inches), spreading it evenly. Arrange the reserved rhubarb pieces on top in a single layer, pressing them gently into the batter so they stay in place during baking.
5. Bake at 350°F (180°C) for 40 minutes uncovered, then tent the top loosely with foil to prevent the rhubarb and top from browning too quickly. Continue baking for 30-35 minutes more (1 hour 10-15 minutes total) until a toothpick inserted into the center comes out clean or with just a few moist crumbs. The foil prevents over-browning while allowing the interior to bake through completely.
6. Let the loaf cool in the tin for 5 minutes, then turn it out onto a wire rack to cool completely. This prevents the bottom from becoming soggy from steam condensation. Slice and serve warm or at room temperature with custard, cream, or alongside a cup of tea.