Key Lime Bars Recipe
Discover the ultimate Key Lime Bars recipe! These bars feature a buttery homemade shortcrust pastry base topped with a tangy, creamy Key lime filling and a refreshing lemon sugar glaze. Perfect for any occasion, these bars are easy to make and absolutely delicious. Get the full recipe and tips for success to create the best Key Lime Bars ever!
As a kid in boarding school, fruit trees were a daily part of life – and one of my favorites was the key lime tree. I vividly remember how we’d savor the tangy limes with just a pinch of salt, a simple pleasure that still makes my mouth water today.
One of the nuns would occasionally surprise us with a heavenly lime dessert, a mystery of flavors that seemed to capture the very essence of joy. Although I never discovered her secret, after years of experimenting and refining my recipe, I believe I’ve come close to recreating that unforgettable taste of childhood. I hope these key lime bars transport you back to your own cherished memories, just as they do for me.
Why is this the best recipe?
- Perfect Balance of Tartness and Sweetness: The combination of fresh lime juice and sweetened condensed milk creates a filling that is both tangy and sweet, offering a delightful balance that is not overly sour or sugary.
- Homemade Shortcrust Pastry Base: The homemade shortcrust pastry base provides a buttery, crisp foundation that perfectly complements the creamy lime filling. The homemade touch ensures a fresh, high-quality base.
- Rich and Creamy Texture: The use of egg yolks and condensed milk in the filling gives these Key Lime bars a luxuriously smooth and creamy texture, making each bite melt in your mouth.
- Refreshing Lemon Sugar Glaze: Topping the bars with a lemon sugar glaze adds an extra layer of flavor and a beautiful finish. The glaze enhances the citrusy taste and also provides a sweet, glossy look that makes the bars visually appealing and irresistible
Ingredients and substitutes
- All-Purpose Flour (for the dough): Forms the base structure of the pastry, providing the necessary gluten for elasticity. You can also use whole wheat flour (for a nuttier flavor) or a gluten-free flour blend (for a gluten-free option).
- Unsalted Butter: Adds richness and flakiness to the crust. You can also use margarine or vegetable shortening (for a dairy-free option).
- Granulated Sugar: Adds a touch of sweetness and helps with browning. You can also use powdered sugar (for a finer texture), coconut sugar (for a different flavor profile).
- Egg Yolk: Binds the dough and adds richness.
- Sweetened Condensed Milk: Adds sweetness and creaminess to the filling. You can also use coconut condensed milk (for a dairy-free option).
- Fresh Lime Juice: Provides the tart, citrus flavor characteristic of key lime tarts. You can also use lemon juice or a mix of lemon and lime juice (if key limes are unavailable).
- Lime Zest: Enhances the lime flavor with aromatic oils. You can also use lemon zest or a combination of lemon and orange zest.
- All-Purpose Flour (for the filling): Acts as a thickening agent. You can also use cornstarch or arrowroot powder (for a gluten-free option).
- Baking Powder: Adds lightness to the filling. You can also use baking soda (use half the amount) combined with an acidic ingredient like lemon juice.
Step-by-step: Key Lime Bars
- Shortcrust dough: Combine flour, sugar, and salt in a large bowl. Add the cold, cubed butter to the flour mixture. Using a pastry cutter or your fingers, work the butter into the flour until it resembles coarse crumbs. Next, add the egg yolk and mix lightly. Gradually add cold water, 1 tablespoon at a time, until the dough comes together. Do not overwork the dough.
- Press and Bake: Press the dough evenly into the bottom of a greased 9 x 13-inch baking pan. Bake in the preheated oven for 15-20 minutes or until the edges are lightly golden. Remove from oven and set aside.
- Key Lime Filling: In a medium bowl, whisk together condensed milk, egg yolks, lime juice, lime zest, flour, baking powder, and vanilla extract until smooth.
- Pour Over Base: Pour the lime filling over the partially baked base, spreading it evenly.
- Bake: Return the pan to the oven and bake for 20-25 minutes or until the filling is set and slightly golden at the edges. Allow the bars to cool completely in the pan on a wire rack.
- Glaze: In a small bowl, whisk together the powdered sugar, lemon juice, and lime zest until smooth. Pour the glaze over the cooled Key Lime bars, spreading it evenly.
- Chill and Cut: Chill the bars in the refrigerator for at least 1 hour before slicing. Cut into squares or rectangles and serve chilled.
- Decorate: Decorate with thin slices of lime triangles and lemon zest.
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Frequently asked questions
How should I store the Key Lime bars?
Store the Key Lime bars in an airtight container in the refrigerator for up to 3 days. They can also be frozen for up to a month. Thaw in the refrigerator before serving.
Can I use bottled lime juice instead of fresh lime juice?
Fresh lime juice is highly recommended for the best flavor. Bottled lime juice often lacks the vibrant, fresh taste and can alter the overall flavor of the bars.
How do I know when the filling is set?
The filling is set when it is firm to the touch and only slightly jiggles in the center when you gently shake the pan. The edges should be slightly golden.
How do I prevent the lemon sugar glaze from being too runny?
Gradually add the lemon juice to the powdered sugar while whisking until you reach your desired consistency. If it becomes too runny, add more powdered sugar. If it’s too thick, add a bit more lemon juice.
Key Lime Tart Bars
Discover the ultimate Key Lime Bars recipe! These bars feature a buttery homemade shortcrust pastry base topped with a tangy, creamy Key lime filling and a refreshing lemon sugar glaze. Perfect for any occasion, these bars are easy to make and absolutely delicious. Get the full recipe and tips for success to create the best Key Lime Bars ever!
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Ingredients
Shortcrust pastry
- 1½ cups (190 g) All-purpose flour
- ½ cup (113 g) Unsalted butter cold and cubed
- ¼ cup (50 g) Granulated sugar
- 1 large Egg yolk
- 2-3 tbsp Cold water
- Pinch of salt
Key lime filling
- 14 oz (396 g) can Sweetened condensed milk
- 4 large Egg yolks or 1 large egg + 2 egg yolks
- ½ cup (120 ml) Fresh lime juice (about 4-5 limes)
- Zest of 2 limes
- 4 tbsp (30 g) All-purpose flour or cornstarch
- ½ tsp Baking powder
- 1 tsp Vanilla extract
Lemon sugar glaze
- 1 cup (120 g) Powdered sugar
- 2 tbsp (113 g) Melted butter
- ¼ cup (120 ml) Lemon juice
Plus
- Lemon zest and thinly sliced lemon triangles for garnish
Method
- Shortcrust dough: Combine flour, sugar, and salt in a large bowl. Add the cold, cubed butter to the flour mixture. Using a pastry cutter or your fingers, work the butter into the flour until it resembles coarse crumbs. Add the egg yolk and mix lightly. Gradually add cold water, 1 tablespoon at a time, until the dough comes together. Do not overwork the dough.1½ cups All-purpose flour, ½ cup Unsalted butter, ¼ cup Granulated sugar, 1 large Egg yolk, 2-3 tbsp Cold water, Pinch of salt
- Press and Bake: Press the dough evenly into the bottom of a greased 9 x 13-inch baking pan. Bake in the preheated oven for 15-20 minutes or until the edges are lightly golden. Remove from oven and set aside.
- Key Lime Filling: In a medium bowl, whisk together condensed milk, egg yolks, lime juice, lime zest, flour, baking powder, and vanilla extract until smooth.14 oz can Sweetened condensed milk, 4 large Egg yolks, ½ cup Fresh lime juice , Zest of 2 limes, 4 tbsp All-purpose flour, ½ tsp Baking powder, 1 tsp Vanilla extract
- Pour Over Base: Pour the lime filling over the partially baked base, spreading it evenly.
- Bake: Return the pan to the oven and bake for 20-25 minutes or until the filling is set and slightly golden at the edges. Allow the bars to cool completely in the pan on a wire rack.
- Glaze: In a small bowl, whisk together the powdered sugar, lemon juice, and lime zest until smooth. Pour the glaze over the cooled Key Lime bars, spreading it evenly.2 tbsp Melted butter, ¼ cup Lemon juice, 1 cup Powdered sugar
- Chill and Cut: Chill the bars in the refrigerator for at least 1 hour before slicing. Cut into squares or rectangles and serve chilled.
- Decorate: Decorate with thin slices of lime triangles.Lemon zest and thinly sliced lemon triangles
Notes
- Use Fresh, High-Quality Ingredients: Fresh lime juice and zest are essential for the best flavor. Avoid bottled lime juice, as it lacks the vibrant taste of fresh limes. Use high-quality butter for the shortcrust pastry to ensure a rich, buttery flavor.
- Chill the Pastry Dough: After mixing the shortcrust pastry, chill it in the refrigerator for about 15-20 minutes. This helps the butter firm up, making the dough easier to work with and resulting in a flakier crust.
- Avoid Overmixing the Dough: When making the shortcrust pastry, work the dough just until it comes together. Overmixing can lead to a tough crust instead of a tender, flaky one.
- Accurate Measurement of Ingredients: Measure all ingredients precisely, especially the flour and condensed milk, to ensure the correct consistency of both the pastry and the filling.
- Evenly Spread the Filling: Pour the lime filling over the partially baked crust and spread it evenly with a spatula to ensure uniform baking and a consistent texture.
- Bake Until Just Set: Bake the filling until it is just set and the edges are slightly golden. Overbaking can cause the filling to become too firm and lose its creamy texture.
- Cool Completely Before Glazing: Allow the bars to cool completely before adding the lemon sugar glaze. This ensures the glaze sets properly and doesn’t melt into the filling.
- Chill Before Slicing: After glazing, chill the bars in the refrigerator for at least an hour. This makes them easier to slice cleanly and enhances the flavors.
- Garnish Just Before Serving: Add the thin slices of lime triangles for garnish just before serving to keep them fresh and vibrant.
- Store Properly: Store the finished Key Lime bars in an airtight container in the refrigerator. They can be kept for up to 3 days and should be served chilled for the best taste and texture.
Nutrition
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Ah yes – I was looking for the perfect dessert to serve at our outdoor picnic and this lime bar was exactly the right choice! I even added some extra condensed milk to make it sweeter and it came out great!
These tangy lime bars were nothing short of epic! Definitely making them again later in the summer.
These bars were so zingy and tasty!
Omg love these! The glaze was so good!