During Week 3 of pastry school, I learned how to make this beautiful Key Lime Tart and I completely fell in love with tarts, almost more than pies! There’s something so special about French-style tarts: the delicate pâte sucrée crust, the silky curd, and the light finish of meringue. Don’t be intimidated by these French terms. The flavor is perfectly balanced, and every bite truly melts in your mouth. In this recipe, I’ll walk you step-by-step through my pastry school learnings on how to make both mini key lime tarts and a full-sized tart.
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Why You’ll Love This Key Lime Tart
If you love a classic key lime pie, this elevated key lime tart recipe is about to become your new favorite dessert.
- Lighter than traditional key lime pie – French-style tarts use pâte sucrée instead of a graham cracker crust, giving a more delicate, buttery bite
- Perfectly balanced flavor – Bright key lime juice meets rich butter and subtle sweetness
- Elegant presentation – Ideal for hosting, dinner parties, or a beautiful plated dessert
- Versatile – Make mini key lime tarts for entertaining or a full tart for slicing
- Bakery-quality texture – Smooth lime curd + crisp tart shell + fluffy Swiss meringue
Ingredients
This key lime tart comes together in three components: a sweet tart crust, a silky lime curd, and a light Swiss meringue.
Sweet Tart Crust (Pâte Sucrée)
For full step-by-step instructions, visit my full guide here: Pâte Sucrée (sweet tart crust) Guide
- Unsalted butter (room temperature) – Adds richness and creates a tender, melt-in-your-mouth tart crust
- Powdered sugar – Sweetens the dough while keeping the texture smooth and delicate
- Vanilla extract – Adds warmth and enhances the overall flavor
- Almond flour – Gives a subtle nutty flavor and soft crumb
- Kosher salt – Balances the sweetness and enhances flavor
- Whole egg – Binds the dough and provides structure
- All-purpose flour – Forms the foundation of the tart shell
This pâte sucrée creates a crisp yet delicate tart shell that pairs beautifully with citrus fillings.
Key Lime Curd
For full instructions, visit: Lime Curd Recipe Guide
- Eggs – Provide structure and thicken the curd into a custard-like consistency
- Granulated sugar – Balances the tartness of the lime and stabilizes the mixture
- Fresh key lime juice – The star ingredient, delivering bright, citrusy flavor
- Unsalted butter – Adds richness and creates a silky, glossy finish
- Gelatin sheet – Lightly stabilizes the curd for clean slicing in tarts
- Optional green food coloring – Enhances presentation with a soft green hue
This lime curd is smooth, vibrant, and perfectly balanced between tart and sweet.
Swiss Meringue
Full guide here: Swiss Meringue Recipe Guide
- Egg whites (room temperature) – Whip into a light, airy topping
- Granulated sugar – Dissolves into the whites for a glossy, stable meringue
- Vanilla bean paste – Adds a soft, bakery-style flavor
Swiss meringue creates a soft, cloud-like topping that complements the tartness of the lime.
How to Make This Key Lime Tart
Below you will find step-by-step instructions for how to make this elegant tart:
STEP 1: Prep Tart Crust – In a stand mixer fitted with the paddle attachment, beat the softened butter and powdered sugar on medium speed until light and fluffy. Add the vanilla extract and salt, mixing until combined. Scrape down the sides of the bowl with a rubber spatula. Add the egg and mix until fully incorporated.
STEP 2: Add the Dry Ingredients – To form your pie crust, add the almond flour first, followed by the all-purpose flour. Mix on low speed just until incorporated. Be careful not to overmix, as too much air can make the crust tough. Once combined, use a bowl scraper to remove the dough and form it into a flat disc. Wrap tightly in plastic wrap and chill for at least 2 hours.
STEP 3: Form Tart Crust – Once chilled, lightly dust your surface with powdered sugar and roll the dough to 1/8-inch thickness, rotating frequently to prevent sticking. Spray your tart pan with non-stick spray and gently press the dough into the pan, trimming any excess. For mini tarts: Dock the bottoms with a fork. For full tarts: Line with parchment and add pie weights.
STEP 4: Bake and Cool – Bake at 325°F (163°C) for about 15 minutes, or until the edges are golden brown with a pale center. Remove from the pan while still warm and allow to cool on a wire rack.
STEP 5: Prep Key Lime Curd – While tarts are baking, you can bloom your gelatin to prep for your key lime curd. To start, place the butter into a mixing bowl (glass or metal recommended). Submerge the gelatin sheet in ice-cold water and allow it to soften for a few minutes, this process is called blooming.
STEP 6: Combine Egg Yolks, Sugar, and Key Lime Juice – In a bowl, whisk together the egg yolks and sugar immediately to prevent the sugar from burning the yolks. Slowly whisk in the fresh key lime juice until fully combined. Then you’re going to place the mixture over a double boiler on medium-low heat. Cook gently, whisking constantly, until the curd thickens and coats the back of a spoon.
STEP 7: Strain, Finish, and Chill – Pour the hot curd through a fine mesh strainer into the bowl with the butter and bloomed gelatin. This removes any cooked egg bits and ensures a smooth texture. Whisk until fully combined and silky. Optionally, add a touch of green food coloring for a soft tint. Press plastic wrap directly onto the surface to prevent a skin from forming and allow the curd to cool completely before using. Set aside.
STEP 8: Fill and Set the Tart – Pour or pipe the cooled lime curd into the cooled tart shell and smooth the top with the back of a spoon or an offset spatula. Cover and refrigerate for as you prep the Swiss meringue.
STEP 9: Make Swiss Meringue – You will need to set up a double boiler to prep the egg whites for this meringue. Ensure egg whites are room temperature. Fill a saucepan with about 1 inch of water and bring to a gentle simmer. Place a heat-safe bowl over the pan, ensuring it does not touch the water.
STEP 10: Heat Egg Whites and Sugar – Inside the bowl, add the egg whites and sugar to the bowl. Whisk constantly until the sugar fully dissolves and the mixture feels smooth (not grainy) when rubbed between your fingers. The mixture should look glossy and feel warm.
STEP 11: Whip the Meringue – Remove the bowl from heat and dry the bottom. Transfer to a stand mixer fitted with a whisk attachment. Beat on medium speed, then increase to medium-high until stiff peaks form. Add vanilla bean paste if desired. Continue whipping until the bowl cools to room temperature and the meringue becomes light, fluffy, and stable. Transfer to a piping bag to use immediately.
STEP 12: Assemble and Serve – Once the tart is fully set, top with Swiss meringue as desired. Garnish with lime zest, lime slices, or elegant finishing touches for presentation. Serve chilled and enjoy this bright, citrus-forward dessert!
Pastry School Tips for Baking Key Lime Tarts
- Use room temperature ingredients for smooth mixing
- Always use fresh key limes for the best flavor (or substitute regular limes if needed)
- Do not overcook the curd, keep it at low heat
- Chill the tart completely before slicing for clean cuts
- Use a tart pan with a removable bottom for easy release
- If your crust puffs, gently press it down with the back of a spoon
Storage & Make Ahead Tips
- Store in the refrigerator for up to 3 days, covered with plastic wrap
- You can make the tart crust and lime curd 1-2 days in advance
- Add the Swiss meringue just before serving for best texture
- Mini tarts are perfect for prepping ahead for events or hosting
- You can store tart dough in the freezer to prep ahead of time
More Dessert Recipes
If you love this light elegant dessert, you’ll also love:
FAQ
Do I need a tart pan?
A tart pan with a removable bottom is ideal, but you can also use a pie dish in a pinch.
Why add gelatin to the lime curd?
It helps stabilize the curd so your tart slices cleanly, especially for mini key lime tarts.
Can I freeze key lime tarts?
Yes, but freeze without the meringue. Add fresh meringue after thawing.
Recipe Card
Key Lime Tart
Equipment
- Adjustment Rolling Pin with Thickness Rings
Ingredients
Sweet Tart Crust (Pâte Sucrée)
- 4 oz Unsalted Butter, (113 g)
- 3 oz Powdered Sugar, (85 g)
- 1 tsp Vanilla Extract
- 1 Egg
- 1 oz Almond Flour, (28 g)
- 7 oz All Purpose Flour
- Pinch of Salt
Key Lime Curd
- 108 grams Eggs, (about 2 whole eggs)
- 108 grams Granulated Sugar
- 108 grams Fresh Key Lime Juice
- 140 grams Unsalted Butter
- 1 Gelatin Sheet, (gold-grade sheet gelatin)
Swiss Meringue
- 90 grams Egg Whites
- 180 grams Granulated Sugar
- 1/2 tsp Vanilla Bean Paste
Instructions
- Prep Tart Crust – In a stand mixer fitted with the paddle attachment, beat the softened butter and powdered sugar on medium speed until light and fluffy. Add the vanilla extract and salt, mixing until combined. Scrape down the sides of the bowl with a rubber spatula. Add the egg and mix until fully incorporated.
- Add the Dry Ingredients – To form your pie crust, add the almond flour first, followed by the all-purpose flour. Mix on low speed just until incorporated. Be careful not to overmix, as too much air can make the crust tough. Once combined, use a bowl scraper to remove the dough and form it into a flat disc. Wrap tightly in plastic wrap and chill for at least 2 hours.
- Form Tart Crust – Once chilled, lightly dust your surface with powdered sugar and roll the dough to 1/8-inch thickness, rotating frequently to prevent sticking. Spray your tart pan with non-stick spray and gently press the dough into the pan, trimming any excess. For mini tarts: Dock the bottoms with a fork. For full tarts: Line with parchment and add pie weights.
- Bake and Cool – Bake at 325°F (163°C) for about 15 minutes, or until the edges are golden brown with a pale center. Remove from the pan while still warm and allow to cool on a wire rack.
- Prep Key Lime Curd – While tarts are baking, you can bloom your gelatin to prep for your key lime curd. To start, place the butter into a mixing bowl (glass or metal recommended). Submerge the gelatin sheet in ice-cold water and allow it to soften for a few minutes, this process is called blooming.
- Combine Egg Yolks, Sugar, and Key Lime Juice – In a bowl, whisk together the egg yolks and sugar immediately to prevent the sugar from burning the yolks. Slowly whisk in the fresh key lime juice until fully combined. Then you're going to place the mixture over a double boiler on medium-low heat. Cook gently, whisking constantly, until the curd thickens and coats the back of a spoon.
- Strain, Finish, and Chill – Pour the hot curd through a fine mesh strainer into the bowl with the butter and bloomed gelatin. This removes any cooked egg bits and ensures a smooth texture. Whisk until fully combined and silky. Optionally, add a touch of green food coloring for a soft tint. Press plastic wrap directly onto the surface to prevent a skin from forming and allow the curd to cool completely before using. Set aside.
- Fill and Set the Tart – Pour or pipe the cooled lime curd into the cooled tart shell and smooth the top with the back of a spoon or an offset spatula. Cover and refrigerate for as you prep the Swiss meringue.
- Make Swiss Meringue – You will need to set up a double boiler to prep the egg whites for this meringue. Ensure egg whites are room temperature. Fill a saucepan with about 1 inch of water and bring to a gentle simmer. Place a heat-safe bowl over the pan, ensuring it does not touch the water.
- Heat Egg Whites and Sugar – Inside the bowl, add the egg whites and sugar to the bowl. Whisk constantly until the sugar fully dissolves and the mixture feels smooth (not grainy) when rubbed between your fingers. The mixture should look glossy and feel warm.
- Whip the Meringue – Remove the bowl from heat and dry the bottom. Transfer to a stand mixer fitted with a whisk attachment. Beat on medium speed, then increase to medium-high until stiff peaks form. Add vanilla bean paste if desired. Continue whipping until the bowl cools to room temperature and the meringue becomes light, fluffy, and stable. Transfer to a piping bag to use immediately.
- Assemble and Serve – Once the tart is fully set, top with Swiss meringue as desired. Garnish with lime zest, lime slices, or elegant finishing touches for presentation. Serve chilled and enjoy this bright, citrus-forward dessert!
Notes
- Use fresh key lime juice for the brightest, most authentic flavor. Regular limes can be used in a pinch, but the tart will taste slightly different.
- Do not overmix the pâte sucrée dough. Make sure you mix just until combined since this will help keep the tart crust tender and delicate.
- Chill the tart dough well before rolling so it is easier to handle and holds its shape during baking. Never allow tart dough to become warm.
- Blind bake the crust before filling to ensure the tart shell stays crisp and does not become soggy.
- Whisk the sugar into the egg yolks immediately when making the lime curd. This helps prevent the sugar from burning the yolks.
- Cook the curd gently over medium-low or low heat and whisk constantly for the smoothest texture.
- Straining the curd is worth it because it removes any bits of cooked egg and gives the filling a silky finish.
- Swiss meringue is best used right away after whipping so it stays fluffy and easy to pipe or spread.
- For clean slices, chill the tart completely before serving.
- A kitchen torch is optional, but lightly toasting the meringue adds beautiful color and a lovely finish!
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Craving More?
If you make this key lime tart recipe, I would absolutely love to see it! Tag me on Instagram at @elicitfolio, follow along on Pinterest, or leave a comment below and let me know what tart recipes you’d love to see next. There’s something so special about sharing these sweet moments together!
