Rhubarb Cake Butter Sauce
Moist rhubarb cake with decadent butter sauce is a delightful dessert that perfectly balances sweet and tangy flavors. This recipe not only brings together the tartness of rhubarb and the richness of butter sauce but also offers a comforting treat suitable for any occasion. Whether you’re hosting a gathering or simply want to indulge in a homemade dessert, this cake will surely impress your family and friends.
Why You’ll Love This Recipe
- Easy to Make: With simple ingredients and straightforward steps, this rhubarb cake is perfect for bakers of all skill levels.
- Moist Texture: The combination of butter and milk ensures a moist cake that stays fresh longer.
- Decadent Butter Sauce: Drizzling the warm butter sauce over the cake adds an irresistible richness that elevates every bite.
- Versatile Dessert: Serve it warm as a cozy treat, or chill it for an afternoon snack—this cake adapts to any occasion.
- Seasonal Goodness: Rhubarb is in season during spring, making this cake a fantastic way to enjoy fresh produce.
Tools and Preparation
Gathering the right tools will simplify your baking experience. Here’s what you’ll need:
Essential Tools and Equipment
- 9-inch square baking pan
- Mixing bowls
- Whisk
- Electric mixer (optional)
- Measuring cups and spoons
- Saucepan
Importance of Each Tool
- 9-inch square baking pan: Ensures even baking and perfect portion sizes for this rhubarb cake.
- Mixing bowls: Allows for easy mixing of ingredients without mess, keeping your workspace organized.
- Electric mixer: While optional, it can save time and effort when creaming the butter and sugar together.
Ingredients
Moist rhubarb cake with decadent butter sauce.
For the Cake
- 1 1/2 cups all-purpose flour
- 1 teaspoon baking powder
- 1/2 teaspoon salt
- 1 cup granulated sugar
- 1/2 cup unsalted butter, softened
- 1 egg
- 1 teaspoon vanilla extract
- 1/2 cup milk
- 2 cups chopped rhubarb
For the Butter Sauce
- 1/2 cup unsalted butter
- 1 cup granulated sugar
- 1/2 cup heavy cream
- 1 teaspoon vanilla extract

How to Make Rhubarb Cake Butter Sauce
Step 1: Preheat the Oven
Preheat your oven to 350°F (175°C) and grease a 9-inch square baking pan to prevent sticking.
Step 2: Prepare the Dry Ingredients
In a medium bowl, whisk together the following dry ingredients:
1. 1 1/2 cups all-purpose flour
2. 1 teaspoon baking powder
3. 1/2 teaspoon salt
Step 3: Cream Butter and Sugar
In a large bowl, cream together these ingredients until light and fluffy:
– 1 cup granulated sugar
– 1/2 cup unsalted butter
Add in these items:
– 1 egg
– 1 teaspoon vanilla extract
Mix until well combined.
Step 4: Combine Wet and Dry Mixtures
Gradually add the flour mixture into the creamed mixture alternately with:
– 1/2 cup milk
Start and end with the flour mixture. Gently fold in:
– 2 cups chopped rhubarb
Step 5: Bake the Cake
Pour the batter into your prepared pan. Spread evenly and bake for about:
– 45-50 minutes or until a toothpick inserted into the center comes out clean.
Step 6: Make the Butter Sauce
While the cake is baking, prepare the butter sauce by combining these ingredients in a saucepan over medium heat:
– 1/2 cup unsalted butter
– 1 cup granulated sugar
– 1/2 cup heavy cream
Cook while stirring until the sugar dissolves and the sauce is smooth. Once done, remove from heat and stir in:
– 1 teaspoon vanilla extract
Step 7: Serve Your Dessert
Once baked, serve your warm rhubarb cake drizzled generously with butter sauce for an indulgent treat!
How to Serve Rhubarb Cake Butter Sauce
Serving your moist rhubarb cake drizzled with delicious butter sauce can elevate any dessert experience. Here are some delightful serving suggestions to enhance your enjoyment of this sweet treat.
Classic Serving Suggestions
- Warm slices – Serve the cake warm right out of the oven for a comforting dessert.
- With ice cream – Pair it with a scoop of vanilla ice cream for a creamy contrast.
- With whipped cream – Top with freshly whipped cream for added richness.
- Garnished with mint – Add fresh mint leaves as a garnish for a pop of color and freshness.
Creative Serving Ideas
- Layered dessert – Cut the cake into squares and layer it in a glass with butter sauce and berries.
- Breakfast treat – Enjoy leftover cake for breakfast alongside yogurt or cottage cheese.
- Pancake topping – Use the butter sauce as a decadent topping for pancakes or waffles.
How to Perfect Rhubarb Cake Butter Sauce
Perfecting your rhubarb cake butter sauce can make all the difference. Here are some tips to ensure your dessert turns out wonderfully every time.
- Use fresh rhubarb – Fresh rhubarb adds vibrant flavor and texture, making your cake more enjoyable.
- Don’t overmix the batter – Gently fold in ingredients to keep the cake light and airy.
- Adjust baking time – Keep an eye on your cake; ovens vary, so check for doneness before the maximum bake time.
- Experiment with spices – Adding cinnamon or nutmeg can enhance the flavor profile of both the cake and sauce.

Best Side Dishes for Rhubarb Cake Butter Sauce
To complement your rhubarb cake butter sauce, consider these delicious side dishes that pair well with this sweet dessert.
- Vanilla Ice Cream – A classic choice that balances the tangy flavors of rhubarb beautifully.
- Roasted Nuts – Almonds or walnuts add crunch and contrast to soft textures.
- Fruit Salad – A light, refreshing fruit salad can cleanse the palate after rich bites of cake.
- Cheese Platter – A selection of cheeses like brie or goat cheese pairs well with sweet desserts.
- Chocolate Fondue – Dip fruits and cake pieces into chocolate for a fun twist on dessert.
- Coffee or Espresso – Serve alongside a warm cup to highlight the flavors in the cake.
Common Mistakes to Avoid
Avoiding mistakes is key to making the perfect Rhubarb Cake Butter Sauce. Here are some common pitfalls and how to steer clear of them:
-
Using too much flour: Adding excess flour can make your cake dry. Always measure carefully, spooning flour into your measuring cup and leveling it off.
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Not checking rhubarb quality: Using wilted or overly mature rhubarb can affect flavor. Choose fresh, firm stalks for the best results.
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Skipping the creaming step: Failing to cream butter and sugar properly can lead to a dense cake. Beat until light and fluffy for optimal texture.
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Overmixing the batter: Mixing too long can develop gluten, resulting in a tough cake. Mix just until combined to keep it moist.
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Ignoring baking time: Overbaking can dry out your cake. Start checking at 45 minutes to ensure it stays moist and delicious.
Storage & Reheating Instructions
Refrigerator Storage
- Store leftover rhubarb cake in an airtight container.
- It will stay fresh for up to 3 days in the refrigerator.
Freezing Rhubarb Cake Butter Sauce
- Wrap the cooled cake tightly in plastic wrap, then foil.
- It can be frozen for up to 3 months. The sauce should be stored separately in a freezer-safe container.
Reheating Rhubarb Cake Butter Sauce
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Oven: Preheat to 350°F (175°C) and warm the cake for about 10-15 minutes until heated through.
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Microwave: Heat individual slices on medium power for 20-30 seconds or until warm.
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Stovetop: Gently reheat the butter sauce over low heat, stirring frequently until warmed through.

Frequently Asked Questions
Here are some common questions about making Rhubarb Cake Butter Sauce along with their answers:
Can I use frozen rhubarb for this recipe?
Yes, you can use frozen rhubarb. Just thaw it first and pat dry to remove excess moisture before adding it to the batter.
How do I know when my rhubarb cake is done?
Insert a toothpick into the center; it should come out clean or with a few crumbs attached, indicating it’s ready.
What can I substitute for butter in the sauce?
You could use coconut oil or margarine as alternatives if you’re looking for a dairy-free option.
Can I add other fruits to my rhubarb cake?
Absolutely! Berries like strawberries or blueberries pair wonderfully with rhubarb and add extra flavor.
How should I serve my rhubarb cake butter sauce?
Serve warm with a generous drizzle of butter sauce over each slice, along with a scoop of vanilla ice cream for added indulgence!
Final Thoughts
This Rhubarb Cake Butter Sauce is an irresistible dessert that combines tartness and sweetness in every bite. Its moist texture makes it delightful while the buttery sauce elevates its appeal. Feel free to customize by adding spices or different fruits to suit your taste. Give this recipe a try—it’s sure to impress!
Moist Rhubarb Cake with Decadent Butter Sauce
Moist Rhubarb Cake with Decadent Butter Sauce is a delightful dessert that marries sweet and tangy flavors, making it the perfect treat for any occasion. This easy-to-make recipe combines fresh rhubarb with a rich butter sauce, creating a comforting dessert that will impress family and friends alike. Whether served warm or chilled, this cake adapts beautifully to gatherings or simple indulgences at home. Enjoy seasonal goodness and simplicity with each slice of this decadent delight.
- Prep Time: 15 minutes
- Cook Time: 50 minutes
- Total Time: 1 hour 5 minutes
- Yield: Approximately 12 servings 1x
- Category: Dessert
- Method: Baking
- Cuisine: American
Ingredients
- 1 1/2 cups all-purpose flour
- 1 teaspoon baking powder
- 1/2 teaspoon salt
- 1 cup granulated sugar
- 1/2 cup unsalted butter, softened
- 1 egg
- 1 teaspoon vanilla extract
- 1/2 cup milk
- 2 cups chopped rhubarb
- 1/2 cup unsalted butter (for sauce)
- 1 cup granulated sugar (for sauce)
- 1/2 cup heavy cream
- 1 teaspoon vanilla extract (for sauce)
Instructions
- Preheat the oven to 350°F (175°C) and grease a 9-inch square baking pan.
- In a medium bowl, whisk together flour, baking powder, and salt.
- In a large bowl, cream together sugar and softened butter until light and fluffy. Add egg and vanilla extract; mix well.
- Gradually add the dry ingredients to the creamed mixture alternately with milk, starting and ending with flour. Gently fold in chopped rhubarb.
- Pour batter into the prepared pan and bake for about 45-50 minutes, or until a toothpick inserted in the center comes out clean.
- While the cake bakes, prepare the butter sauce by combining butter, sugar, heavy cream, and vanilla extract in a saucepan over medium heat until smooth.
- Once baked, serve warm drizzled generously with butter sauce.
Nutrition
- Serving Size: 1 slice (approximately 100g)
- Calories: 320
- Sugar: 30g
- Sodium: 180mg
- Fat: 18g
- Saturated Fat: 10g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 39g
- Fiber: 1g
- Protein: 3g
- Cholesterol: 40mg