Lemon Squares
These vintage lemon squares have a buttery shortbread base and a bright, sweet lemon filling with just the right amount of tang. The base is tender and crumbly, while the soft lemon layer bakes up smooth and slightly chewy around the edges. They really are excellent!
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This treasured recipe was originally published by Woodward’s Stores in Cooking with Mona and is credited to Mona Brun. Recipes like this deserve to be kept and passed along.
Short Description
These vintage lemon squares have a buttery shortbread crust topped with a soft, tangy lemon filling and a generous dusting of icing sugar. The fresh lemon juice and zest give them a bright flavour, while the base stays tender and slightly crumbly. A classic old-fashioned dessert that is simple, reliable and very good.
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Why It’s Good
This classic lemon square recipe has a lovely balance of sweet and tart. The buttery shortbread base is sturdy enough to hold the filling, but it still melts nicely when you take a bite. I especially like the slightly chewy edges.
The recipe also uses ordinary baking ingredients, so there is no complicated shopping involved. Pouring the lemon mixture over the crust while it is still hot helps the layers bake together. Let the pan cool completely before cutting. It makes a big difference.
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When to Serve It
These easy homemade lemon squares are perfect for spring and summer gatherings, afternoon tea, bridal or baby showers, holiday dessert trays and family celebrations. Their fresh lemon flavour is especially nice after a heavier meal.
They are also a practical dessert for potlucks because one pan makes 18 to 24 squares and they are easy to transport. Add the icing sugar shortly before serving for the prettiest finish.
How to Make Lemon Squares
The flour, icing sugar and softened butter are mixed until coarse clumps begin to form, then pressed evenly into a greased 9 x 13-inch pan. This simple buttery shortbread crust creates a firm yet tender base for the vintage lemon squares. Press it right into the corners so the lemon filling has an even layer underneath.
Fresh eggs, lemon juice and finely grated lemon zest give these vintage lemon squares their bright citrus flavour and soft, tangy filling. Use freshly squeezed lemon juice for the best taste, and grate only the yellow part of the peel so the zest stays fragrant without becoming bitter.
Finish with a Dusting of Icing Sugar
Once the vintage lemon squares are baked and the lemon filling has set, let them cool until warm rather than hot. Sift icing sugar evenly over the top for that classic old-fashioned finish. The light sweetness balances the tangy lemon layer and makes the squares look especially pretty before cutting.
- Measure the flour lightly. Spoon the flour into the measuring cup and level it off instead of scooping directly from the bag. Too much flour can make the shortbread crust dry and crumbly.
- Use softened butter, not melted butter. Soft butter blends into the flour and icing sugar while still creating those small clumps that give the base its tender, buttery texture.
- Press the crust evenly into the pan. Pay a little extra attention to the corners and edges. Thin areas can brown too quickly, while thicker sections may stay soft.
- Use fresh lemon juice and zest. Bottled juice will work in a pinch, but fresh lemon gives these old-fashioned lemon squares a brighter, cleaner flavour. Only grate the yellow peel because the white pith tastes bitter.
- Prepare the lemon filling while the crust bakes. The filling should be ready to pour over the base as soon as it comes out of the oven. The hot crust helps the two layers bake together nicely.
- Beat the filling only until smooth. Overbeating can add too much air and create a foamy top. A few bubbles are normal, though. This is a vintage homemade recipe, so it does not need to look perfectly smooth.
- Watch the centre near the end of baking. The lemon filling should look set around the edges with only a slight movement in the middle. It will continue to firm as it cools.
- Wait before adding the icing sugar. Let the squares cool until warm, not piping hot. If the surface is too hot, the icing sugar can melt and disappear.
- Cool completely before slicing. This is important. Warm lemon squares can look runny and are harder to cut neatly.
- Use a clean, sharp knife. For tidy squares, chill the pan briefly and wipe the knife between cuts. The slightly chewy corner pieces are often the first ones to disappear.
- Extra-Lemony Lemon Squares: Add another ½ teaspoon of fresh lemon zest for a stronger citrus flavour. I would not add much more lemon juice, though, because too much liquid can make the filling softer and harder to slice.
- Lemon-Lime Squares: Replace 2 tablespoons of the lemon juice with fresh lime juice. The flavour stays bright and tangy, with a slightly sharper citrus finish.
- Orange Lemon Squares: Replace half of the lemon zest with finely grated orange zest. This gives the classic lemon filling a softer, sweeter citrus flavour without changing the vintage recipe too much.
- Raspberry Lemon Squares: Drop small spoonfuls of seedless raspberry jam over the lemon filling before baking, then gently swirl with a knife. Use a light hand. Too much jam can overpower the fresh lemon flavour.
- Coconut Lemon Squares: Sprinkle about ½ cup of sweetened shredded coconut over the hot shortbread crust before adding the lemon filling. It adds a little chewiness and works surprisingly well with the tart lemon layer.
- Thicker Shortbread Crust: For a slightly firmer base, press the crust very firmly into the pan and bake it for an extra 2 to 3 minutes. Watch the edges so they do not become too dark.
- Decorative Icing Sugar Finish: Place a paper doily or stencil over the cooled squares before dusting with icing sugar. Lift it straight upward to leave a pretty vintage pattern on top.
- Smaller Lemon Bar Bites: Cut the cooled lemon squares into small bite-sized pieces for dessert trays, afternoon tea or holiday gatherings. Chill them first for cleaner edges.
- Refrigerate after cooling. Once the vintage lemon squares are completely cool, place them in an airtight container and store them in the refrigerator for up to 5 days. The chilled lemon filling becomes firmer and the bars are often even easier to slice the next day.
- Separate the layers. When stacking the lemon squares, place parchment or wax paper between each layer. This keeps the icing sugar and soft lemon topping from sticking to the bottoms of the other squares.
- Add fresh icing sugar before serving. Icing sugar can absorb moisture and almost disappear in the refrigerator. A quick fresh dusting before serving brings back that pretty, old-fashioned finish.
- Serve chilled or at room temperature. These classic lemon squares taste bright and refreshing straight from the fridge, but the buttery shortbread crust softens slightly when they sit at room temperature for about 15 minutes.
- Freeze for longer storage. Arrange the cooled lemon squares in a single layer and freeze until firm. Transfer them to a freezer-safe container with parchment between the layers and freeze for up to 3 months.
- Thaw slowly. Defrost frozen lemon squares overnight in the refrigerator. Wait until they are fully thawed before adding icing sugar, or it may turn damp and patchy.
- Avoid leaving them out too long. Because the fresh lemon filling contains eggs, return any leftovers to the refrigerator after serving. For the best texture, do not leave them at room temperature for more than about 2 hours.
Lemon Squares
Equipment
- 9 × 13-inch baking pan
- Large mixing bowls
- Pastry blender or two butter knives
- Measuring cups and spoons
- Fine grater or microplane for lemon zest
- Citrus juicerÂ
- Whisk or electric hand mixer
- Flour sifter or fine-mesh sieve
- Rubber spatula
- Sharp knife for cutting the lemon squares
- Parchment paper optional for easier removal
Ingredients
Buttery Shortbread Base
- 2 cups all-purpose flour lightly spooned into the measuring cup
- ½ cup icing sugar
- 1 cup butter softened
Fresh Lemon Filling
- 4 eggs large
- 2 cups granulated sugar
- 6 tablespoons lemon juice fresh
- 1 teaspoon lemon zest finely grated
- ¼ cup all-purpose flour
- ¼ teaspoon baking powder
- ¼ teaspoon salt
Topping
- Sifted icing sugar as needed
Instructions
Prepare the Pan and Oven
- Preheat the oven to 350°F.
- Lightly grease a 9 x 13-inch baking pan.
Make the Shortbread Base
- Add the flour, icing sugar and softened butter to a large mixing bowl.
- Using a pastry blender or two knives, cut the butter into the dry ingredients until the mixture begins to form soft clumps.
- Press the mixture evenly and firmly into the bottom of the prepared baking pan.
- Bake for 20 minutes, or until the edges are just beginning to turn lightly golden.
Make the Lemon Filling
- While the shortbread base is baking, lightly beat the eggs in a large bowl.
- Add the granulated sugar, fresh lemon juice and grated lemon zest. Mix until combined.
- In a separate small bowl, sift together the flour, baking powder and salt.
- Add the dry ingredients to the lemon and egg mixture. Beat only until the filling is smooth. Do not overmix.
Bake the Lemon Squares
- As soon as the hot shortbread base comes out of the oven, carefully pour the lemon filling evenly over the top.
- Return the pan to the oven and bake at 350°F for approximately 25 minutes, or until the centre is set and no longer looks wet.
- Allow the lemon squares to cool slightly. While they are still warm, but not hot, sift icing sugar generously over the top.
- Cool completely before cutting into squares.
Vintage Decorating Idea
- For a traditional decorative finish, place a paper doily with an open pattern over the cooled lemon squares. Sift icing sugar over the doily, then carefully lift it straight upward. The delicate pattern will remain on top.
Notes
- Freshly squeezed lemon juice gives these classic lemon squares their brightest flavour.
- Lightly spoon the flour into the measuring cup instead of packing it down. Too much flour can make the shortbread base dry.
- Pour the lemon filling over the base while it is still hot. This helps the two layers bake together properly.
- Let the squares cool completely before cutting. The lemon filling will continue to firm as it cools.
- For cleaner slices, chill the pan briefly and wipe the knife between cuts.
Nutrition
Ellen Britt
Hi, I’m Ellen — a passionate home cook dedicated to creating easy, flavorful recipes inspired by real-life cooking and shared family traditions. Every recipe on this site is a true collaboration, developed and tested together in our kitchen to ensure it’s reliable, simple to follow, and absolutely delicious.
What to Serve with Lemon Squares
These lemon squares pair beautifully with Spinach and Cottage Cheese Quiche. The savoury, creamy quiche balances the sweet and tangy lemon dessert, making the combination perfect for brunch, afternoon tea, Mother’s Day or a light family lunch.
