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Old-Fashioned Rhubarb Cake – Soft, Buttery, and Drizzled in Warm Sauce

By Corinne Griffith
May 16, 2025 1 Min Read
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This Rhubarb Cake with Butter Sauce is the kind of recipe that brings back memories of grandma’s kitchen: moist, tender cake with tart bursts of rhubarb and a golden butter sauce you’ll want to pour on everything. Whether served warm out of the oven or the next day reheated with extra sauce, it’s a timeless dessert that satisfies in every season.

It’s simple enough for a casual treat but elegant enough to serve at a spring brunch or family gathering. One bite, and you’ll understand why this cake’s a keeper.


Why I Love This Recipe

What makes this recipe a standout is the balance between tart rhubarb and the ultra-sweet, silky butter sauce. The buttermilk gives the cake a tender crumb, while the rhubarb keeps it moist and adds that signature zing. And that sauce? It’s like pouring liquid caramel-vanilla gold over every slice.

Bonus: it uses basic pantry ingredients, comes together easily, and tastes even better the next day—if it lasts that long.


Ingredients

For the Cake:

  • 2 cups diced rhubarb (fresh or frozen, thawed and drained)
  • 1 cup granulated sugar
  • ½ cup unsalted butter, softened
  • 1 large egg
  • 1 tsp vanilla extract
  • 1 cup buttermilk
  • 2 cups all-purpose flour
  • 1 tsp baking soda
  • ½ tsp salt

For the Butter Sauce:

  • ½ cup unsalted butter
  • 1 cup granulated sugar
  • ½ cup heavy cream
  • 1 tsp vanilla extract

Swaps and Notes

  • No buttermilk? Add 1 tbsp lemon juice or vinegar to 1 cup milk and let sit 5 minutes.
  • Gluten-free option: Use a 1:1 gluten-free flour blend.
  • Want extra tartness? Add a few chopped cranberries or raspberries to the batter.
  • Prefer less sweetness? Use ¾ cup sugar in the cake and reduce sugar in the sauce to ¾ cup.

How to Make Rhubarb Cake with Butter Sauce

1. Preheat and Prep

  • Preheat oven to 350°F (175°C).
  • Grease and flour a 9×13-inch baking dish.

2. Make the Cake Batter

  • In a large bowl, cream together the butter and sugar until light and fluffy.
  • Add egg and vanilla, beating until smooth.
  • In a separate bowl, whisk together flour, baking soda, and salt.
  • Gradually add dry ingredients to the wet mixture, alternating with buttermilk, starting and ending with dry.
  • Fold in the diced rhubarb.

3. Bake

  • Pour the batter into the prepared baking dish and spread evenly.
  • Bake for 45–50 minutes, or until a toothpick inserted into the center comes out clean.
  • Let cool slightly in the pan.

4. Make the Butter Sauce

  • In a saucepan, melt the butter over medium heat.
  • Stir in the sugar and heavy cream, whisking constantly.
  • Cook until smooth and lightly thickened, about 5–7 minutes.
  • Remove from heat and stir in vanilla extract.

5. Serve

  • Slice the cake warm or at room temperature.
  • Drizzle with warm butter sauce just before serving.
  • Optional: Top with whipped cream, vanilla ice cream, or even a sprinkle of cinnamon sugar.

Tips for Success

  • Use fresh rhubarb when in season for the best flavor and color.
  • Be sure to drain frozen rhubarb thoroughly to avoid a soggy batter.
  • Want that golden crust? Sprinkle a little coarse sugar over the batter before baking.
  • The cake stays moist for days—store covered at room temperature or refrigerate for longer freshness.

Serving Suggestions & Pairings

This rich, nostalgic cake pairs beautifully with these ChefManiac favorites:

  • Big Family Banana Pudding to balance sweet-tart with creamy comfort
  • Old-School No-Bake Cookies for a chewy, chocolatey contrast
  • Caramel Apple Pie Cookies if you’re going for a rustic dessert spread
  • No-Bake Oreo Cream Pie for something chilled to contrast the warm cake
  • Chocolate Chip Cookie Bites as a snackable sweet side

Storage & Leftovers

  • Room Temp: Store covered for up to 2 days.
  • Fridge: Keeps well for up to 5 days.
  • Freeze: Slice, wrap tightly, and freeze for up to 3 months (sauce separately).
  • Reheat: Warm cake slices and sauce gently in the microwave before serving.

More Recipes You’ll Love

If you love classic desserts with a twist, try:

  • Big Family Banana Pudding
  • Old-School No-Bake Cookies
  • No-Bake Oreo Cream Pie
  • Caramel Apple Pie Cookies
  • Chocolate Chip Cookie Bites

Final Thoughts

This Rhubarb Cake with Butter Sauce is a dessert that brings people back to the table. With its balance of tangy fruit and rich, buttery sweetness, it’s a must-bake when rhubarb is in season—or whenever you’re craving a taste of home. Pour on that sauce and dig in.

Tried it? Tag @ChefManiac and share your sweet-and-tart masterpiece! And follow for more classic bakes, seasonal treats, and desserts that taste like a warm hug.


Old-Fashioned Rhubarb Cake – Soft, Buttery, and Drizzled in Warm Sauce

Old-Fashioned Rhubarb Cake – Soft, Buttery, and Drizzled in Warm Sauce

is the kind of recipe that brings back memories of grandma’s kitchen:

Prep: min | Cook: min | Total: min

Servings:

Ingredients

  • For the Cake:
  • 2 cups diced rhubarb (fresh or frozen, thawed and drained)
  • 1 cup granulated sugar
  • ½ cup unsalted butter, softened
  • 1 large egg
  • 1 tsp vanilla extract
  • 1 cup buttermilk
  • 2 cups all-purpose flour
  • 1 tsp baking soda
  • ½ tsp salt
  • For the Butter Sauce:
  • ½ cup unsalted butter
  • ½ cup heavy cream

Instructions

  1. Preheat and Prep: Preheat oven to 350°F (175°C).
  2. Grease and flour a 9x13-inch baking dish.
  3. Make the Cake Batter: In a large bowl, cream together the butter and sugar until light and fluffy.
  4. Add egg and vanilla, beating until smooth.
  5. In a separate bowl, whisk together flour, baking soda, and salt.
  6. Gradually add dry ingredients to the wet mixture, alternating with buttermilk, starting and ending with dry.
  7. Fold in the diced rhubarb.
  8. Bake: Pour the batter into the prepared baking dish and spread evenly.
  9. Bake for 45–50 minutes, or until a toothpick inserted into the center comes out clean.
  10. Let cool slightly in the pan.
  11. Make the Butter Sauce: In a saucepan, melt the butter over medium heat.
  12. Stir in the sugar and heavy cream, whisking constantly.
  13. Cook until smooth and lightly thickened, about 5–7 minutes.
  14. Remove from heat and stir in vanilla extract.
  15. Serve: Slice the cake warm or at room temperature.
  16. Drizzle with warm butter sauce just before serving.
  17. Optional: Top with whipped cream, vanilla ice cream, or even a sprinkle of cinnamon sugar.

Nutrition

  • Calories:
  • Fat:
  • Carbs:
  • Protein:

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