Rhubarb Cake with Butter Sauce – A Sweet & Tangy Classic

If you’re looking for a dessert that feels both nostalgic and indulgent, this Rhubarb Cake with Butter Sauce is just the thing. The tender, moist cake is studded with tart rhubarb pieces, which balance beautifully with the sweetness of a rich, warm butter sauce poured over the top. Every bite is the perfect mix of tangy and sweet — the kind of comfort dessert that never goes out of style.

It’s simple enough for a weekday treat but special enough for gatherings, especially in spring and early summer when rhubarb is in season.

🍰 Rhubarb Cake with Butter Sauce Recipe

Ingredients

For the Cake:

• 2 cups all-purpose flour

• 1 tsp baking soda

• ½ tsp salt

• 1 ½ cups brown sugar

• ½ cup unsalted butter, softened

• 1 large egg

• 1 cup buttermilk

• 2 cups fresh rhubarb, diced

For the Butter Sauce:

• ½ cup unsalted butter

• 1 cup granulated sugar

• ½ cup heavy cream

• 1 tsp vanilla extract

Instructions

1. Preheat Oven

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

2. Make the Cake Batter

   • In a bowl, whisk flour, baking soda, and salt.

   • In another bowl, cream butter and brown sugar until light and fluffy.

   • Beat in the egg, then stir in buttermilk.

   • Gradually add the dry ingredients until just combined.

   • Fold in rhubarb.

3. Bake

   • Pour batter into prepared pan.

   • Bake 35–40 minutes, or until a toothpick comes out clean.

4. Make the Butter Sauce

   • In a saucepan, melt butter over medium heat.

   • Stir in sugar and cream, cooking until sugar dissolves and sauce thickens slightly.

   • Remove from heat and stir in vanilla.

5. Serve

   • Cut warm cake into squares and drizzle with hot butter sauce.