There’s nothing quite like the comforting taste of a homemade crisp, and these Strawberry Rhubarb Squares take that classic dessert to a delightful new level. Imagine a luscious, vibrant filling made from the perfect blend of sweet strawberries and tart rhubarb, nestled between a buttery, crumbly oat and shortbread base and a generous, golden-brown topping. These squares are a celebration of seasonal flavors, offering a symphony of textures and tastes that make them an instant favorite for any occasion, from casual family meals to elegant summer gatherings.
The magic of these squares begins with an effortlessly prepared, homemade strawberry rhubarb filling. This iconic duo is, for many, the epitome of spring and early summer flavors. The natural sweetness of ripe strawberries beautifully balances the invigorating tang of rhubarb, creating a harmony that is simply irresistible. This delectable filling is then encased by an irresistible oat crumble, which cleverly serves a dual purpose: forming the sturdy, flavourful base and providing a perfectly golden, crunchy topping. The result? A dessert that’s bursting with freshness, incredibly easy to make, and utterly satisfying.
Baked in a convenient 8×8-inch pan, this recipe is perfectly sized for a family treat. However, its versatility shines through, as it can be easily doubled to cater to a larger crowd, making it an ideal candidate for your next summer picnic, BBQ, or potluck. Enjoy these squares straight from your hand for a casual snack, or serve them on a plate with a fork for a more refined dessert experience. For an extra touch of indulgence, warm them slightly and pair them with a small scoop of creamy vanilla ice cream – a combination that promises pure bliss with every bite. The sweet-tart fruit, the warm, buttery crumble, and the cool, melting ice cream create a dessert experience that is truly unforgettable.
Why Strawberry Rhubarb Squares Are a Must-Try
Beyond their delightful flavor, these squares offer several compelling reasons to add them to your baking repertoire. They are relatively simple to prepare, even for novice bakers, making them a fantastic entry point into fruit-based desserts. The use of both fresh and frozen fruit options means you can enjoy these treats virtually year-round, extending the joy of summer beyond its traditional season. Furthermore, the crumbly texture from the oats provides a wonderful contrast to the soft fruit filling, creating a dynamic eating experience. This recipe is also highly customizable, allowing you to tweak ingredients to suit your preferences or dietary needs, as detailed below. Whether you’re looking for a comforting baked good, a refreshing dessert, or a crowd-pleasing potluck contribution, these Strawberry Rhubarb Squares tick all the boxes.
Essential Ingredients & Smart Substitutions
Crafting the perfect Strawberry Rhubarb Squares starts with understanding your ingredients and knowing when and how to make smart substitutions. Here’s a closer look at the key components:
Rhubarb: Fresh or Frozen, Always Delicious
Rhubarb is the star of this dish, bringing its signature tartness. You can confidently use either fresh or frozen diced rhubarb. If using fresh, ensure it’s firm and bright in color. If using frozen, there’s no need to thaw it beforehand; simply add it directly to the saucepan. For those who aren’t fans of rhubarb or don’t have it on hand, you can absolutely make an all-strawberry version. In this case, use a total of 3 cups of diced strawberries. Since strawberries are naturally sweeter than rhubarb, you’ll likely want to reduce the added white sugar in the filling to about 1/2 cup to maintain a balanced sweetness without being overly sugary. This flexibility ensures you can enjoy these squares whenever the craving strikes.
Strawberries: Sweetness Personified
Just like rhubarb, strawberries can be either fresh or frozen. When using fresh strawberries, make sure they are ripe and fragrant for the best flavor. For both fresh and frozen varieties, it’s crucial to roughly chop them before measuring. This ensures an even distribution throughout the filling and allows them to break down beautifully during cooking. If you’re using frozen strawberries, their natural juices will contribute to the filling, and they’ll soften just as effectively as fresh ones.
Cornstarch: The Thickening Agent
Cornstarch, also commonly known as cornflour in many parts of the world, plays a vital role in thickening the fruit filling. It prevents the squares from becoming watery and helps create that luscious, jam-like consistency. It’s essential for binding the fruit juices and sugar, ensuring the filling sets properly. Don’t skip this ingredient for the best results.
Lemon Juice: A Brightening Touch
While lemon juice is a common ingredient in jam-making for its acidity and pectin activation, its role here is primarily to brighten the fruit flavors and enhance the overall taste profile. It adds a subtle tang that complements the sweet-tart dynamic of the strawberries and rhubarb. Although it contributes to a more vibrant flavor, it’s not a critical structural component in this specific recipe. So, if you find yourself without lemon juice, you can simply omit it without compromising the success of your squares.
Rolled Oats: For That Perfect Crumble
This recipe specifically calls for large flake, old-fashioned rolled oats. These oats are larger and thicker than quick-cooking oats, which gives the crumble a superior, chewier texture and a more substantial feel. Their robust nature stands up well to baking, resulting in a satisfyingly rustic topping. While some bakers might be tempted to use quick-cooking oats, they tend to become softer and less defined when baked, so it’s best to stick with old-fashioned rolled oats for the intended texture.
Flour Combination: Depth of Flavor and Structure
The recipe cleverly uses a combination of all-purpose flour and whole wheat flour for the base and topping. Whole wheat flour adds a lovely nutty flavor and a touch of wholesome goodness that complements the oats and fruit beautifully. However, if you prefer, or if you don’t have whole wheat flour on hand, you can replace it with an equal amount of all-purpose flour. Ensure your flour is spooned and leveled for accurate measurement, which is crucial for the perfect crumble consistency.
Salt: A Flavor Amplifier
Salt is not just for savory dishes; it’s an indispensable ingredient in baking, as it enhances and balances the sweetness of other ingredients. This recipe calls for coarse kosher salt, or 1/4 teaspoon of fine salt for equivalence. If you opt to use salted butter instead of unsalted, remember to significantly reduce the amount of additional salt you add – just a tiny pinch should suffice – to prevent your squares from becoming overly salty.
Butter: The Foundation of Flavor
Unsalted butter is specified in the recipe to give you complete control over the salt content. Melted butter is essential for creating that moist, cohesive crumble that forms both the base and topping. If salted butter is all you have, it’s perfectly acceptable to use; just be sure to adjust the added salt as mentioned above. The butter contributes rich flavor and helps achieve the desirable golden-brown crust.
Recipe Tips & Tricks for Perfect Squares!
- Parchment Paper is Your Best Friend: Always line your baking pan with parchment paper, making sure to leave an overhang on all sides. This simple step is a game-changer, allowing you to easily lift the entire slab of baked squares out of the pan for clean and effortless cutting.
- Cooling for Clean Cuts: For neat, perfectly shaped squares, it’s highly recommended to let them cool completely at room temperature, and then refrigerate them for at least an hour before cutting. The chilled filling and firm crumble will result in much cleaner slices, making them look professionally baked.
- Storage & Make-Ahead Magic: These delightful squares store remarkably well. Keep them covered at room temperature for several days. While the crumble might soften slightly over time, the flavors will continue to meld beautifully. Feel free to make them a day or two in advance for entertaining or meal prep.
- Freezing for Future Enjoyment: Strawberry Rhubarb Squares are also freezer-friendly! Once completely cooled, wrap individual squares or the whole slab tightly in plastic wrap, then place in an airtight container or freezer bag. They can be frozen for up to 3 months. Thaw at room temperature or gently warm in the oven before serving.
Top Tip for Feeding a Crowd!
Planning a larger gathering or simply want more of these amazing squares? No problem! This recipe doubles beautifully. Instead of an 8×8-inch pan, simply bake the doubled recipe in a 9×13-inch baking dish. Adjust baking time as needed, keeping an eye out for bubbling edges and a golden-brown crumble topping.
Troubleshooting Common Baking Issues
Even simple recipes can sometimes present challenges. Here are a few tips to troubleshoot common issues you might encounter:
- Soggy Bottom Crust: This can happen if the fruit filling is too wet or the bottom crust isn’t baked enough before the filling is added. Ensure your fruit filling thickens sufficiently on the stove. Also, make sure to press the base mixture firmly into the pan.
- Crumble Too Hard/Soft: If your crumble is too hard, you might have overmixed it or used too much butter. If it’s too soft, it might need a few more minutes in the oven, or perhaps your butter wasn’t fully melted and incorporated. Aim for streusel-like crumbs.
- Filling Not Set: This usually means the cornstarch didn’t activate properly or there wasn’t enough. Make sure the fruit mixture comes to a full boil and thickens on the stove. Cooling the squares completely (and chilling them) is also vital for the filling to set.
Get the Recipe: Strawberry Rhubarb Squares
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15 minutes
30 minutes
45 minutes
12 squares
Ingredients
For the Filling:
- 1 1/2 cups rhubarb, diced, fresh or frozen
- 1 1/2 cups strawberries, fresh or frozen, diced
- 1 Tablespoon lemon juice
- 3/4 cup white sugar
- 3 Tablespoons cornstarch
- 1 teaspoon vanilla extract, or vanilla bean paste
For the Base and Topping (Crumble):
- 1 1/2 cups large flake, old-fashioned rolled oats
- 1 1/4 cups all-purpose flour, spooned and leveled
- 6 Tablespoons whole wheat flour
- 3/4 cups light brown sugar, packed
- 1 teaspoon baking powder
- 1/2 teaspoon coarse kosher salt, or 1/4 tsp fine salt
- 1/2 teaspoon ground cinnamon
- 3/4 cup unsalted butter, melted
Instructions
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In a medium saucepan, combine the diced rhubarb, strawberries, lemon juice, white sugar, and cornstarch. Place the saucepan over medium heat on your stove-top, stirring continuously to prevent sticking. As the fruit begins to soften, use a potato masher or a fork to gently break it down into smaller, more uniform pieces. Continue cooking and stirring until the mixture comes to a full boil and visibly thickens, creating a jam-like consistency. Once thickened, remove the saucepan from the heat and stir in the vanilla extract. It’s crucial to allow this fruit filling to cool to at least lukewarm before proceeding with the next steps. For best results, you can prepare the filling ahead of time and refrigerate it; just ensure it reaches room temperature before assembling the squares.
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Preheat your oven to 350°F (175°C), ensuring it’s not on a fan-assisted setting unless you adjust for convection baking. Prepare an 8×8-inch baking pan by lining it with parchment paper, allowing a generous overhang on all four sides. This overhang will act as handles, making it much easier to lift the baked squares out of the pan once cooled.
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In a large mixing bowl, combine all the dry ingredients for the base and topping: the large flake rolled oats, all-purpose flour, whole wheat flour, packed light brown sugar, baking powder, coarse kosher salt, and ground cinnamon. Whisk these dry ingredients together thoroughly to ensure they are well combined. Pour the melted unsalted butter over the dry mixture and stir with a spoon or your hands until the ingredients are fully incorporated and form a cohesive, streusel-like crumb mixture. The mixture should be moist enough to hold together when pressed, but still crumbly.
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Take approximately two-thirds (2/3) of the prepared crumb mixture and press it firmly and evenly into the bottom of your parchment-lined baking pan. Use the back of a spoon or your fingers to create a compact base. Next, carefully spread the cooled strawberry rhubarb filling in an even layer over the pressed crust, ensuring it reaches the edges. Finally, sprinkle the remaining one-third (1/3) of the crumb mixture evenly over the fruit filling, creating a delightful streusel topping.
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Transfer the pan to your preheated oven and bake for 30 to 35 minutes. You’ll know the squares are ready when the fruit filling is visibly bubbling at the edges, and the streusel topping has turned a beautiful light golden brown. Once baked, remove the pan from the oven and place it on a wire rack to cool completely. For the cleanest and most appealing slices, especially if you desire neat squares for serving, allow the squares to cool fully to room temperature, then transfer the pan to the refrigerator for at least an hour (or longer) before lifting out the slab using the parchment paper overhang and cutting into 12 pieces. This chilling step helps the filling and crumble set perfectly.
Notes
American, Canadian
Dessert
Jennifer Maloney
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More delightful strawberry rhubarb recipes to explore!
If you’ve fallen in love with the irresistible combination of strawberries and rhubarb in these squares, you’re in for a treat! This dynamic duo shines in a variety of desserts, each offering a unique way to enjoy their sweet-tart harmony. From rustic cobblers to comforting rolls, there’s always another delightful way to feature these seasonal favorites in your kitchen. Expand your repertoire with these equally delicious recipes:
Each of these recipes leverages the best of strawberry and rhubarb, promising more moments of sweet and tart enjoyment. Don’t hesitate to dive into these other incredible baking adventures!