Key Lime Pie
This Key Lime Pie pairs a tart and creamy custard with a buttery graham cracker base. Authentic key limes give the filling a gentle citrus flavor that stays bright against the sweet creaminess, while the crust adds crunch in every slice.
The result is balanced rather than heavy, rich without feeling overly sweet, and finished with a small spoonful of whipped cream.
It works as a dessert at any time of year. Serve it at summer gatherings when citrus feels fresh and light, or bring it to the table at Thanksgiving or Christmas when a cool and tangy finish is welcome after a large meal.
The method below is based on the original Key Lime Pie recipe, with the same classic combination at its heart.
The pie serves 8 servings, with one serving as the standard portion. That size makes it practical for a family dessert or a small gathering, and the slices hold their shape well when the pie has set fully in the fridge.
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Why You’ll Love this Key Lime Pie Recipe
Unlike quicker versions that use a ready made shell, this recipe builds both parts from scratch. The graham cracker crust is homemade, and the filling is a custard style filling baked in the oven. That extra time is worthwhile because baking gives the smoothest and creamiest texture, with a clean lime flavor that does not taste sharp or flat.
The classic flavor is based on sweetened condensed milk and lime juice, a traditional combination that has defined this pie for generations. Originating in the Florida Keys, it has remained a favorite for over 70 years.
Its history is described as contested, but its popularity has endured, and it is easy to see why it becomes a requested choice for special occasions.
For another classic version to compare, readers can also explore the Classic Key Lime Pie recipe. It offers a useful point of reference while keeping the focus on the baked custard method used here, where patience in the oven and in chilling delivers the best slice.
Ingredient Notes
The ingredients for the Key Lime Pie are listed below, with full measurements for the crust and for the filling.
Graham Cracker Crust
The crust has three components. Graham crackers are pulsed in a food processor to form crumbs quickly, which gives an even base that presses neatly into the pan. White sugar adds a little sweetness to counter the tang of the filling, while melted unsalted butter binds the crumbs together and gives the crust its crunch.
- 1 ½ cups graham cracker crumbs
- 2 tablespoons white sugar
- 5 tablespoons unsalted butter, melted
Key Lime Pie
The filling uses egg yolks for richness and creaminess. Sweetened condensed milk is an essential traditional ingredient that should not be omitted, because its thickness and sweetness balance the tart juice. Juice from approximately 25 key limes gives the pie its signature flavor, with zest from 3 limes adding extra brightness.
Full fat sour cream balances the sweetness and tartness, while only a pinch of salt is needed. A citrus juicer is helpful for juicing the limes and getting as much juice as possible from each one.
- 3 large egg yolks
- 1 ⅓ cups sweetened condensed milk
- ½ cup key lime juice, from about 25 key limes
- 1 tablespoon key lime zest, from about 3 key limes
- 1 tablespoon full fat sour cream
- pinch of salt
You will also need:
- 9 inch tart pan or pie dish
- measuring cups
- large baking sheet
- medium mixing bowl
- whisk
- spatula
- wire rack
How to Make the Best Key Lime Pie
The method is divided into three clear stages. First prepare the crust, then whisk the filling, and finally assemble and bake the pie. Working in this order lets the crust cool a little while the filling comes together, which keeps the process smooth and unhurried.
First, prepare the Graham cracker crust.
To prepare the crust, graham cracker crumbs and melted butter are mixed with a fork in a medium bowl until thoroughly combined. If you are using the full crust mixture, include the white sugar at this stage so the sweetness is distributed evenly through the crumbs.
Pour the mixture into a 9 inch tart pan and press it down with a flat bottomed measuring cup. Set the pan on a large baking sheet and bake in a preheated 350°F oven for 11 minutes. Remove the crust and leave it to cool slightly while the filling is made.
Next, make the key lime filling.
For the filling, lower the oven temperature to 325°F and check that the key lime juice is strained and seed free. Combine egg yolks, sweetened condensed milk, key lime juice, lime zest, sour cream, and salt in a medium mixing bowl and whisk until very smooth.
Straining keeps seeds out of the smooth custard, which matters for texture in the finished slice.
Lastly, assemble and bake the key lime pie.
Pour the smooth filling mixture over the baked graham cracker crust. Bake for 20 minutes, until the center still moves slightly while the outer part appears set. That slight movement is the sign to remove the pie from the oven, rather than waiting until the center looks completely firm.
After baking, cool the pie on a wire rack for 2 hours, then move it to the refrigerator to set overnight. Chilling fully before slicing helps each slice keep a clean edge and a creamy center.
Recipe Variations
For a frozen version, bake the pie in a freezer safe container such as a foil tray. Once cooled, wrap it in foil or plastic wrap and freeze it. After freezing, cut it into portions, lift each portion from the pan, fit it with a popsicle stick, and coat it in melted chocolate for a cold treat on a stick.
A mostly homemade shortcut is useful when fresh key limes are unavailable or pressing them is impractical. Use regular lime zest plus store bought bottled key lime juice in place of fresh juice and zest, and use a ready made graham cracker crust when needed. The pie will still follow the same baked custard idea, with less time spent juicing.
For topping, homemade whipped cream is made by beating chilled heavy whipping cream with powdered sugar and vanilla extract until stiff peaks form. Pipe swirls over the pie and finish with lime slices. If you prefer a version that needs no oven time at all, the No bake key lime pie offers a different route to a similar citrus dessert.
How to Serve
The pie is presented as a dessert pairing for main courses that highlight lime flavor. Serve it after dishes where lime already plays a central role, so the dessert echoes the meal without repeating the same flavors exactly.
- Fish Tacos with Lime Crema
- Vietnamese Salad Rolls with Shrimp
- Chipotle Chicken Burrito Bowls with Lime Cilantro Rice
- Sheet Pan Chicken Fajitas
- Thai Coconut Red Curry with Prawns
- Chilaquiles Verdes
Recipe Tips and Tricks
Fresh juice is recommended for the best flavor. Key limes are often available in bags during summer at local grocery stores. Wash them, roll them between palm and counter to soften them, cut them open, and juice them with a citrus juicer to extract as much juice as possible.
Butter should be measured carefully because the butter to crumb proportion determines crust texture and flavor. Excess butter changes both, so measure the melted butter as listed rather than adding extra for safety. A crust that is too buttery can feel soft instead of crunchy, while a crust with too little butter may not hold together as well.
Sweetened condensed milk should not be omitted or replaced. Its thickness, creaminess, and sweetness balance the tart juice and create the expected creamy filling and flavor. Replacing it changes the filling, so keep it as listed for the classic result.
Measure butter carefully, use fresh juice when possible, and keep the sweetened condensed milk as listed.
Storing and Freezing Instructions
Storage depends on how soon the pie will be served. Follow the guidance below for the fridge, for serving temperature, and for the freezer, so leftovers stay in good condition.
How to Store
Wrap leftovers in plastic cling wrap or aluminum foil and keep them refrigerated for three to four days. If the pie will be stored, delay adding whipped cream until just before serving, so the topping stays fresh.
How to Reheat
This classic pie is at its best when served cold. There is no need to warm it before serving, and chilling keeps the custard firm and refreshing.
How to Freeze
The pie holds up well in the freezer when it is portioned and packed carefully. Freeze the whole pie, then remove it from the pan and cut it into slices.
Wrap each slice individually in foil or plastic wrap, then store the wrapped slices in an airtight container or freezer safe bag for up to 3 months. Thaw in the fridge for several hours before serving.
More Dessert
For more dessert ideas in the same citrus family, explore Mini key lime pies. They offer another format for enjoying key lime flavor, while keeping the focus on the classic baked pie above as the main recipe.
Keep the main pie as the centerpiece for a gathering, and use related desserts for variety when a second option is welcome. That way, the table offers choice without moving away from the lime flavor that defines this dessert.
FAQs
Can I use regular limes instead of key limes for key lime pie?
Yes, you can, but the flavor will be a little sharper and less floral than with key limes. For the closest result, use bottled key lime juice and regular lime zest if fresh key limes are hard to find. The recipe needs 1/2 cup of key lime juice, which comes from about 25 key limes, plus 1 tablespoon of zest from about 3 key limes. Check that bottled juice is unsweetened key lime juice rather than a sweetened lime drink.
How do you know when key lime pie is done baking?
Bake the filling at 325°F for 20 minutes until the outside seems set and the center still has a slight jiggle. That gentle tremble is normal and will firm as the pie cools, so do not wait for a completely solid center. Overbaking can cause cracks and a rubbery texture. Let the pie cool on a wire rack for 2 hours, then refrigerate it overnight to set fully before slicing.
Can you freeze key lime pie?
Yes, key lime pie freezes well for up to 3 months because its dense custard holds little air. Freeze the baked pie, remove it from the pan, cut it into slices, and wrap each slice separately in foil or plastic wrap. Store the wrapped slices in an airtight container or freezer-safe bag. Thaw slices in the refrigerator for several hours before serving, and add whipped cream just before serving.
What is the best crust for key lime pie?
A buttery graham cracker crust is the classic choice because its crunch balances the soft, tart filling. Combine 1 1/2 cups of graham cracker crumbs with 2 tablespoons of white sugar and 5 tablespoons of melted unsalted butter. Press the mixture firmly and evenly into a 9-inch tart pan, reaching up the sides at a steady thickness. Bake at 350°F for 11 minutes, then let the crust cool a bit before adding the filling so it stays crisp.
Key Lime Pie
Key Lime Pie This Key Lime Pie pairs a tart and creamy custard with a buttery graham cracker base. Authentic key limes give the filling a gentle citrus flavor that stays bright against the sweet creaminess, while the crust adds crunch in every slice.
- Total Time: 155 min
- Yield: 8 servings 1x
Ingredients
For the graham cracker crust
1 ½ cups graham cracker crumbs
2 tablespoons white sugar
5 tablespoons unsalted butter, melted
For the key lime pie
3 large egg yolks
1 ⅓ cups sweetened condensed milk
½ cup key lime juice, from about 25 key limes
1 tablespoon key lime zest, from about 3 key limes
1 tablespoon full-fat sour cream
pinch salt
Instructions
Prepare the graham cracker crust
1-Preheat the oven to 350°F: Preheat the oven to 350°F.
2-In a medium mixing bowl, add the: In a medium mixing bowl, add the graham cracker crumbs and melted butter. Use a fork to mix until well combined.
3-Pour the crumbs into a 9-inch tart: Pour the crumbs into a 9-inch tart pan. Use a flat bottomed measuring cup to press the crumbs into the pan.
4-Place the pan onto a large baking: Place the pan onto a large baking sheet, and transfer into the oven. Bake for 11 minutes. Remove from the oven and allow to cool a bit while you make the filling.
Make the key lime pie
5-Turn the oven down to 325°F: Turn the oven down to 325°F. Ensure your key lime juice is strained and free of any seeds.
6-In a medium mixing bowl, add the: In a medium mixing bowl, add the egg yolks, sweetened condensed milk, key lime juice, lime zest, sour cream, and salt. Whisk until very smooth.
7-Pour the mixture over the graham cracker: Pour the mixture over the graham cracker crust.
8-Place the pie into the oven to: Place the pie into the oven to bake for 20 minutes, or until the centre has a slight jiggle, but the outside seems set.
9-Remove from the oven and allow to: Remove from the oven and allow to cool on a wire rack for 2 hours, before transferring into the fridge to set overnight.
Last Step:
Please leave a rating and comment letting us know how you liked this recipe! This helps our business to thrive and continue providing free, high-quality recipes for you.- Prep Time: 135 min
- Cook Time: 20 min
- Method: bake
Nutrition
- Serving Size: 1 serving
- Calories: 350 calories
- Sugar: 35.7 g
- Sodium: 500.2 mg
- Fat: 14.8 g
- Saturated Fat: 8 g
- Carbohydrates: 49.5 g
- Fiber: 1.4 g
- Protein: 6.4 g
- Cholesterol: 106 mg
