Key lime chess pie is a brilliant mash-up of two beloved Southern desserts: the bright, tangy filling of a Key lime pie and the simple, pantry-friendly crust of a chess pie. This version swaps the traditional pastry crust for a buttery, press-in shortbread crust, making it incredibly easy to assemble. The filling is a silky, custard-like blend of sweetened condensed milk, egg yolks, and fresh lime juice, baked until just set, resulting in a pie that’s both rich and refreshingly tart.
Ingredients
- For the crust:
- 1 ½ cups (190 g) all-purpose flour
- ¼ cup (50 g) granulated sugar
- ½ teaspoon salt
- ½ cup (115 g) cold unsalted butter, cut into small pieces
- 2–3 tablespoons ice water
- For the filling:
- 4 large egg yolks
- 1 (14-ounce / 397 g) can sweetened condensed milk
- ½ cup (120 ml) fresh Key lime juice (about 20–25 Key limes, or use bottled)
- 1 tablespoon Key lime zest (from about 4–5 Key limes)
- 1 teaspoon vanilla extract
- Pinch of salt
- Optional: ½ cup (120 ml) heavy cream, whipped with 1 tablespoon powdered sugar for serving
Instructions
- Make the crust: In a medium bowl, whisk together flour, sugar, and salt. Cut in the cold butter using a pastry blender or your fingers until the mixture resembles coarse meal with some pea-sized butter bits. Drizzle with 2 tablespoons ice water and stir with a fork until the dough just comes together; add another tablespoon if needed. Press the dough evenly into the bottom and up the sides of a 9-inch (23 cm) pie plate. Chill for 30 minutes.
- Preheat the oven to 350°F (175°C). Line the chilled crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, then remove the weights and parchment and bake for 5–7 minutes more, until the crust is lightly golden. Set aside to cool slightly while you make the filling. Reduce the oven temperature to 325°F (165°C).
- Make the filling: In a large bowl, whisk the egg yolks until smooth. Add the sweetened condensed milk, Key lime juice, zest, vanilla, and salt. Whisk until fully combined; the mixture will thicken slightly. Let it sit for 5 minutes—this allows the lime juice to react with the condensed milk.
- Bake the pie: Pour the filling into the warm crust. Bake at 325°F (165°C) for 25–30 minutes, until the edges are set but the center still jiggles slightly when you gently shake the pan. The filling should reach 160°F (71°C) on an instant-read thermometer, which is the USDA FSIS safe minimum for egg dishes.
- Cool completely: Place the pie on a wire rack and let it cool to room temperature, about 1 hour. Then refrigerate for at least 2 hours, or until fully chilled and set. Serve cold, with whipped cream if desired.
Tips
- Use fresh Key limes if possible: Bottled Key lime juice is a fine substitute and more convenient, but fresh juice has a brighter, more floral flavor. If you can’t find Key limes, regular Persian limes work too—just use the same amount.
- Don’t overbake: The filling will look slightly wobbly in the center when done; it will set as it cools. Overbaking can cause cracking and a rubbery texture.
- Chill thoroughly: This pie needs at least 2 hours in the fridge to set properly. Slicing it too soon will result in a runny mess.
- Zest before juicing: Always zest the limes before squeezing them—it’s much easier when the fruit is whole.
Serving Suggestions
Serve this pie well-chilled, straight from the refrigerator. A dollop of lightly sweetened whipped cream or a scoop of vanilla ice cream balances the tartness beautifully. For a pretty presentation, garnish with thin lime slices or a sprinkle of additional zest just before serving. It’s perfect for summer cookouts, potlucks, or any time you want a refreshing, make-ahead dessert.
Variations
- Traditional chess pie crust: If you prefer a classic chess pie, use a single 9-inch (23 cm) unbaked pie crust (homemade or store-bought) instead of the press-in shortbread. No need to pre-bake; just pour the filling in and bake at 350°F (175°C) for 35–40 minutes.
- Lemon chess pie: Swap the Key lime juice and zest for lemon juice and zest (about ½ cup / 120 ml juice and 1 tablespoon zest). The flavor will be more tart and less floral.
- Meringue topping: For a showstopper, top the baked pie with a Swiss meringue (made from 3 egg whites and ¾ cup / 150 g sugar) and toast it with a kitchen torch or under the broiler for 1–2 minutes.
- Gluten-free: Use a gluten-free all-purpose flour blend in the crust; the rest of the recipe is naturally gluten-free.
Storage and Reheating
Store leftover pie covered in the refrigerator for up to 4 days. The crust may soften slightly over time, but the filling stays firm. This pie is best served cold, so there’s no need to reheat. If you prefer a slightly softer texture, let it sit at room temperature for 10–15 minutes before serving. You can also freeze the baked, cooled pie for up to 2 months—wrap it tightly in plastic wrap and then foil. Thaw overnight in the refrigerator before serving.
Frequently Asked Questions
Can I use regular limes instead of Key limes? Yes, absolutely. Regular Persian limes are more tart and less floral, but they make a delicious pie. Use the same amount of juice and zest.
Why is my pie runny in the middle? It’s likely underbaked. The center should jiggle slightly when you remove it from the oven, but it should not be liquid. If it’s still very wobbly after 30 minutes, bake for 5 more minutes. Also, make sure to chill it completely—the filling sets as it cools.
Can I make this pie without eggs? The eggs are essential for the custard texture. We don’t recommend substituting them, as the pie won’t set properly.
Do I need to blind-bake the crust? Yes, for the press-in shortbread crust, blind-baking (baking it empty first) ensures it stays crisp and doesn’t become soggy from the filling. If using a traditional pie crust and baking the filling immediately, you can skip blind-baking.
Can I use bottled Key lime juice? Yes, bottled Key lime juice works well and is a convenient substitute. Just make sure it’s 100% juice with no added sugar.
How do I know when the pie is done? The edges will look set and slightly puffed, while the center will still have a slight jiggle. An instant-read thermometer inserted into the center should read 160°F (71°C), which is the USDA FSIS safe minimum for egg dishes.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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