These Blackberry Lemon Squares are a sweet and tangy treat! A crumbly crust holds a zesty lemon filling topped with juicy blackberries, making every bite burst with flavor.
They’re the perfect mix of tart and sweet, reminding me of summer days. I like to serve them chilled for a refreshing dessert—ideal for picnics or just at home!
Key Ingredients & Substitutions
All-Purpose Flour: This is the base for both the crust and the filling. If you’re looking for gluten-free options, use a 1:1 gluten-free flour blend. Personally, I love using whole wheat flour for added flavor in the crust!
Lemon Juice & Zest: Fresh lemons really make a difference here. If fresh lemons aren’t available, bottled lemon juice can work, but the zest won’t be as vibrant. For a twist, try lime juice instead for a different citrus flavor.
Blackberries: Fresh blackberries give a lovely tartness and color. If you can’t find blackberries, raspberries or blueberries are perfect substitutes. I often mix berries for a more complex flavor!
Egg Whites: For the meringue, fresh egg whites are ideal for that fluffy texture. If you’re vegan, you can use aquafaba (the liquid from canned chickpeas) as a substitute, which can whip up similarly!
How Do I Achieve the Perfect Meringue?
Making meringue can seem tricky, but with a few tips, you’ll have it down! Start with a clean bowl and beaters, as any grease can prevent the egg whites from whipping properly. Here are some steps to follow:
- Make sure your egg whites are at room temperature.
- Beat in cream of tartar as it helps stabilize the meringue.
- Add the sugar gradually while continuing to beat until glossy and stiff peaks form. This ensures it doesn’t just dissolve away!
- Once spread over your dessert, remember to toast it for that beautiful finish!
How to Make Delicious Blackberry Lemon Squares
Ingredients You’ll Need:
For the Crust:
- 1 1/2 cups all-purpose flour
- 1/2 cup powdered sugar
- 1/4 cup granulated sugar
- 1/4 teaspoon salt
- 3/4 cup unsalted butter, cold and cut into cubes
For the Lemon Filling:
- 3 large eggs
- 1 cup granulated sugar
- 1/4 cup all-purpose flour
- 1/2 cup freshly squeezed lemon juice (about 2-3 lemons)
- Zest of 1 lemon
For the Blackberry Topping:
- 2 cups fresh blackberries (plus extra for garnish)
- 1/4 cup granulated sugar
- 1 tablespoon lemon juice
- 1 tablespoon cornstarch (optional, for thickening)
For the Meringue Topping:
- 3 large egg whites
- 1/2 cup granulated sugar
- 1/4 teaspoon cream of tartar
- 1/2 teaspoon vanilla extract (optional)
For Garnish:
- Powdered sugar, for dusting
How Much Time Will You Need?
This delightful recipe takes about 30 minutes to prepare and about 45 minutes to bake. After layering everything, you’ll want to chill the squares in the fridge for at least 2 hours before serving. So grab a cup of tea and relax while you wait!
Step-by-Step Instructions:
1. Prepare the Crust:
First, preheat your oven to 350°F (175°C). Then, grab a 9×9 inch baking pan and line it with parchment paper, letting some paper hang over the edges for easy removal later. In a mixing bowl, combine the flour, powdered sugar, granulated sugar, and salt. Cut the cold butter into the mixture using a pastry cutter or your fingers until it looks like coarse crumbs. Now, press this mixture firmly and evenly into the bottom of your pan. Bake for 18-20 minutes or until it turns a nice golden brown. Once done, take it out of the oven and let it cool slightly.
2. Prepare the Lemon Filling:
In a separate bowl, beat together the eggs, granulated sugar, flour, lemon juice, and lemon zest until the mixture is smooth. Pour this tangy lemon filling over your hot crust. Pop it back in the oven and bake for an additional 20-25 minutes, or until the filling is set but still has a slight jiggle in the center. Once finished, take it out and let it cool for a bit.
3. Prepare the Blackberry Topping:
In a small saucepan, combine the fresh blackberries, sugar, and lemon juice. Cook this over medium heat, mashing the berries with a spoon until the mixture thickens and becomes syrupy; this should take about 5-7 minutes. If you prefer your topping thicker, dissolve the cornstarch in a little water and stir it into the mix. Let this beautiful blackberry compote cool slightly after cooking. Spread it evenly over the cooled lemon layer—yum!
4. Make the Meringue Topping:
To make the meringue, beat the egg whites and cream of tartar in a clean bowl using an electric mixer until soft peaks form. Gradually add in the sugar while continuing to beat until you reach stiff, glossy peaks. If you’d like, beat in the vanilla extract for extra flavor. Now, spoon or pipe your meringue over the blackberry layer, spreading it out evenly.
5. Toast the Meringue:
Time to add a little toast! Use a kitchen torch to lightly brown the meringue, or if you don’t have a torch, you can place the pan under the broiler for about 1-2 minutes. Keep an eye on it to prevent burning—nobody wants that!
6. Chill and Serve:
Let your delicious creation cool completely, then refrigerate it for at least 2 hours to help everything set beautifully. When you’re ready to serve, lift the bars out of the pan using the parchment paper overhang. Cut into squares, garnish with extra blackberries, and dust lightly with powdered sugar. Serve chilled, and enjoy every tasty bite!
This recipe yields tart and refreshing blackberry lemon squares with a buttery crust, zesty lemon filling, sweet blackberry topping, and light toasted meringue. Enjoy your dessert adventure!
Can I Use Frozen Blackberries Instead of Fresh?
Yes, you can use frozen blackberries! Just make sure to thaw them first and drain any excess liquid to avoid making your topping too watery. The flavor may be slightly less bright, but they still work great!
What If I Don’t Have Cream of Tartar for the Meringue?
If you don’t have cream of tartar, you can substitute it with an equal amount of lemon juice or white vinegar. These acids will help stabilize the egg whites just like cream of tartar does!
Can I Make the Blackberry Lemon Squares Ahead of Time?
Absolutely! You can prepare the entire dessert a day ahead of serving. Just keep them covered in the fridge to ensure they stay fresh. They’ll be even better as the flavors have time to meld together.
How Should I Store Leftovers?
Store any leftovers in an airtight container in the fridge for up to 3 days. If you find the meringue has become a bit soft, you can briefly re-toast it using a kitchen torch or under the broiler to revive its texture!
