There’s nothing quite like the vibrant tartness of fresh rhubarb balanced by sweet, fluffy meringue. These Simple Rhubarb Meringue Bars capture the essence of springtime in a delightful, easy-to-make dessert perfect for any occasion. With a crisp shortbread crust, a tangy rhubarb filling, and a cloud-like topping, this recipe is sure to become a seasonal favorite.

Why You Will Love This Recipe

These bars are the ultimate crowd-pleaser because they perfectly balance contrasting textures and flavors. The buttery, slightly salty shortbread base provides a sturdy foundation for the intensely flavored, tart rhubarb filling. Topping it all off is a light, airy, and sweet meringue that bakes to a beautiful golden brown. They are surprisingly straightforward to prepare, making them ideal for both weeknight baking and special gatherings. If you are looking for a way to showcase fresh rhubarb, these Simple Rhubarb Meringue Bars are an unbeatable choice.

Ingredients

• For the Crust:
• 1 cup all-purpose flour
• 1/2 cup unsalted butter, cold and cubed
• 1/4 cup granulated sugar
• 1/4 teaspoon salt
• For the Rhubarb Filling:
• 2 cups fresh rhubarb, chopped into 1/2-inch pieces
• 3/4 cup granulated sugar
• 2 tablespoons cornstarch
• 1 large egg yolk
• 1 teaspoon vanilla extract
• For the Meringue Topping:
• 3 large egg whites, room temperature
• 3/4 cup granulated sugar
• 1/4 teaspoon cream of tartar (or a few drops of lemon juice)

Step-by-Step Instructions

1. Preheat your oven to 350°F (175°C). Line a 9×9 inch baking pan with parchment paper, leaving an overhang on two sides for easy removal.
2. Prepare the Crust: In a medium bowl, whisk together the flour, 1/4 cup sugar, and salt. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs. Press the mixture evenly into the bottom of the prepared baking pan.
3. Bake the Crust: Bake the crust for 15 to 18 minutes, or until the edges are lightly golden brown. Remove from the oven and set aside while you prepare the filling. Keep the oven temperature at 350°F (175°C).
4. Prepare the Rhubarb Filling: In a bowl, combine the chopped rhubarb, 3/4 cup sugar, and cornstarch. Toss well to coat the rhubarb thoroughly.
5. Cook the Filling: Pour the rhubarb mixture into a small saucepan. Cook over medium heat, stirring frequently, until the rhubarb softens slightly and the mixture thickens substantially, about 5 to 7 minutes. Remove from heat and let cool for about 5 minutes. Whisk in the egg yolk and vanilla extract until smooth—this helps stabilize the filling.
6. Assemble the Layers: Carefully spread the cooked rhubarb filling evenly over the warm, pre-baked crust.
7. Prepare the Meringue: In a clean, grease-free bowl of a stand mixer fitted with the whisk attachment (or using a hand mixer), beat the egg whites until soft peaks form. Gradually add the 3/4 cup of sugar, one tablespoon at a time, beating well after each addition. Add the cream of tartar and continue beating until stiff, glossy peaks form (the meringue should hold its shape firmly).
8. Top and Bake: Gently spread or pipe the meringue over the rhubarb layer, ensuring the meringue touches the edges of the crust all the way around to seal in the filling.
9. Bake the Meringue: Return the pan to the 350°F (175°C) oven and bake for 12 to 15 minutes, or until the meringue peaks are lightly golden brown.
10. Cool Completely: Let the Simple Rhubarb Meringue Bars cool completely in the pan on a wire rack before attempting to slice. This is crucial for clean cuts, as the filling needs time to set fully. Slice into squares and enjoy.

Expert Tips / Pro Tips

For the best results with these Simple Rhubarb Meringue Bars, follow these key tips:

• Ensure your Meringue Bowl is Spotless: Any trace of fat or grease (even residual oil from your hands) will prevent the egg whites from whipping up into stiff, glossy peaks. Wipe your bowl and whisk attachment with a little lemon juice or vinegar before starting.
• Don’t Skip the Pre-Bake: Partially baking the shortbread crust prevents it from becoming soggy once the wet rhubarb mixture is added.
• Thickening the Filling: Cooking the rhubarb separately with the cornstarch ensures the filling sets properly and isn’t runny when sliced. Adding the egg yolk off the heat prevents scrambling.
• Cooling is Non-Negotiable: Resist the urge to cut these bars warm. They will collapse into a soupy mess. Allow them to cool at room temperature for at least 3 hours, or chill them slightly for cleaner slices.
• Use Room Temperature Egg Whites: Room temperature egg whites incorporate air much faster and achieve greater volume, resulting in a lighter meringue.

Variations & Substitutions

While the classic combination is wonderful, you can certainly adjust this recipe:

• Citrus Boost: Add the zest of one lemon to the rhubarb filling for an extra layer of brightness.
• Berry Blend: Mix 1 cup of chopped rhubarb with 1 cup of fresh strawberries or raspberries for a “Berry-Rhubarb Delight.” Adjust sugar slightly if the added berries are very sweet.
• Crust Alternative: For a graham cracker crust, substitute the flour mixture with finely crushed graham crackers mixed with melted butter and sugar, then press into the pan (no pre-baking required for cracker crusts).
• Alternative Topping: If you prefer a less sweet topping, substitute the meringue with a simple cream cheese frosting after the bars have fully cooled.

Serving Suggestions

These bars are fantastic served slightly chilled. They pair beautifully with additions that complement their tartness:

• A dusting of powdered sugar just before serving adds a professional, elegant finish.
• Serve alongside a dollop of fresh, unsweetened whipped cream to cut the sweetness of the meringue.
• They make an excellent accompaniment to strong coffee or a light herbal tea.

Storage, Freezing & Reheating

Proper storage is key to enjoying these bars over several days.

Refrigeration: Store leftover Simple Rhubarb Meringue Bars in an airtight container in the refrigerator. Because of the meringue topping, they are best consumed within 3 to 4 days. The meringue may weep slightly over time, which is normal.

Freezing: Freezing meringue-topped desserts can be tricky, as the meringue can become sticky or absorb freezer odors. If you must freeze them, slice the bars first. Place them in a single layer on a baking sheet and freeze until solid. Transfer to an airtight, freezer-safe container, separating layers with wax paper. Thaw overnight in the refrigerator. Note that the texture of the meringue may soften significantly upon thawing.

Nutrition Information

Please note that these values are approximate and will vary based on specific ingredient measurements and brands used. This information is provided for general guidance only and is not a substitute for professional dietary advice.

FAQ

Why is my meringue weeping or sweating after baking?

Meringue weeping, or the formation of tiny beads of syrup on the surface, is usually caused by under-beating the sugar or cutting the sugar in too quickly, leading to undissolved sugar granules. It can also happen if the bars are chilled too rapidly or stored in an area with high humidity. Ensure you beat the sugar until stiff, glossy peaks are achieved.

Can I use frozen rhubarb instead of fresh for these bars?

Yes, you can substitute fresh rhubarb with frozen. Do not thaw the rhubarb first. Simply add the frozen rhubarb directly to the saucepan with the sugar and cornstarch, but you may need to cook it for 2-3 minutes longer until the excess liquid has evaporated and it begins to thicken.

How do I ensure the rhubarb filling doesn’t soak my crust?

The key is the combination of pre-baking the crust for 15 minutes and cooking the rhubarb filling on the stovetop until it is considerably thick before spreading it onto the base. This initial cooking removes excess moisture.

Can I make these bars gluten-free?

You can easily make these crust gluten-free by substituting the all-purpose flour in the crust with a high-quality 1-to-1 gluten-free baking blend containing xanthan gum. The filling and meringue are naturally gluten-free.

Simple Rhubarb Meringue Bars

A delightful combination of tart rhubarb filling sandwiched between a buttery shortbread crust and topped with a sweet, fluffy meringue.

Print Recipe Pin Recipe

Prep Time 30 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr 15 minutes mins

Servings: 12 bars

Course: Baking, Dessert

Cuisine: American

Calories: 280

Ingredients Method Notes

Ingredients

  

Shortbread Crust

• 1 cup All-purpose flour
• 1/2 cup Unsalted butter Cold, cubed
• 1/4 cup Granulated sugar
• 1/4 teaspoon Salt

Rhubarb Filling

• 2 cups Rhubarb Chopped into 1/2 inch pieces
• 1/2 cup Granulated sugar
• 2 tablespoons Cornstarch
• 1 tablespoon Lemon juice

Meringue Topping

• 3 large Egg whites Room temperature
• 1/2 cup Granulated sugar
• 1/2 teaspoon Vanilla extract

Method

 

Instructions

1. Preheat oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper, leaving an overhang for easy removal.
2. Prepare the crust: In a medium bowl, combine the flour, 1/4 cup sugar, and salt. Cut in the cold, cubed butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs. Press the mixture evenly into the bottom of the prepared pan.
3. Bake the crust for 18-20 minutes, or until lightly golden brown. Remove from the oven and set aside to cool slightly while preparing the filling.
4. Prepare the filling: In a small saucepan, combine the chopped rhubarb, 1/2 cup sugar, cornstarch, and lemon juice. Cook over medium heat, stirring constantly, until the rhubarb softens and the mixture thickens significantly (about 5-7 minutes). Spread the warm rhubarb filling evenly over the pre-baked crust.
5. Prepare the meringue: In a stand mixer fitted with the whisk attachment, beat the egg whites on medium speed until soft peaks form. Gradually add the remaining 1/2 cup sugar, one tablespoon at a time, beating until stiff, glossy peaks form and the sugar is completely dissolved. Beat in the vanilla extract.
6. Top the rhubarb layer with the meringue, spreading it evenly to cover completely, ensuring the meringue touches the edges of the crust to seal it in. Return the pan to the oven and bake for an additional 20-25 minutes, or until the meringue is set and lightly golden brown on the peaks.
7. Allow the bars to cool completely in the pan on a wire rack before lifting out by the parchment overhang and slicing into 12 squares. Store leftovers refrigerated.

Notes

Ensure the butter for the crust is very cold for the best texture. For the most stable meringue, make sure the mixing bowl is completely grease-free, and the egg whites are at room temperature.