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Rhubarb Cake with Butter Sauce – Sweet, Tangy, and Absolutely Cozy

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This moist rhubarb cake is perfectly sweet and tangy, topped with a warm buttery cream sauce that soaks into every bite. A comforting dessert perfect for spring and summer!

  • Author: Ella
  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
  • Total Time: 1 hour
  • Yield: 12 servings
  • Category: Dessert
  • Method: Oven
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

For the Cake:

2 cups all-purpose flour

1 1/2 cups granulated sugar

2 teaspoons baking powder

1/2 teaspoon salt

2 cups diced rhubarb (fresh or well-drained frozen)

1 cup milk

1/2 cup melted butter

For the Butter Sauce:

1/2 cup butter

1 cup granulated sugar

1 cup heavy cream

Instructions

Preheat Oven:
Preheat oven to 350°F (175°C). Grease a 9×13-inch baking pan.

Make the Cake Batter:
In a large bowl, whisk together flour, sugar, baking powder, and salt. Fold in diced rhubarb.
Add milk and melted butter. Stir just until combined — do not overmix.

Bake the Cake:
Pour batter into prepared pan. Smooth the top and bake for 45 minutes, or until a toothpick inserted in the center comes out clean.
Let cool in pan for 10–15 minutes before slicing.

Make the Butter Sauce:
In a saucepan over medium heat, combine butter, sugar, and heavy cream. Stir continuously and bring to a gentle boil. Boil for 1 minute, then remove from heat and let cool slightly.

Serve:
Serve cake slices warm or at room temperature. Drizzle with warm butter sauce just before serving.

Notes

Use Fresh or Frozen Rhubarb: If using frozen, be sure to thaw and drain thoroughly to avoid soggy cake.

Flavor Boosts: Add 1/2 teaspoon cinnamon, nutmeg, or a bit of orange or lemon zest to enhance flavor.

Serving Tip: Warm the sauce just before pouring for best texture and soak.

Storage: Store leftovers covered at room temperature for 1 day or refrigerated for up to 3 days.