Key Lime Pie Factory Key Largo–Style Pie at Home

This Key Largo–style key lime pie is a Florida Keys-inspired dessert with a crisp graham cracker crust and a smooth, tangy filling made from key lime juice, sweetened condensed milk, and egg yolks. A brief bake sets the filling while keeping its texture creamy; chill it thoroughly and serve cold with whipped cream.

Ingredients

1½ cups (150 g) graham cracker crumbs, about 10–11 full sheets
⅓ cup (75 g) packed light brown sugar
6 tablespoons (85 g) unsalted butter, melted
4 large egg yolks
1 can (14 oz / 397 g) sweetened condensed milk
½ cup (120 ml) key lime juice, preferably bottled 100% key lime juice or freshly squeezed and strained
1 teaspoon finely grated key lime zest, plus extra to garnish
¾ cup (180 ml) cold heavy whipping cream
1 tablespoon (8 g) powdered sugar
⅛ teaspoon vanilla extract

Instructions

Heat the oven to 350°F (175°C). Set a rack in the center. In a medium bowl, stir together the graham cracker crumbs and brown sugar, then mix in the melted butter until the crumbs are evenly damp and hold together when pressed.
Press the crumb mixture firmly over the bottom and up the sides of a 9-inch (23 cm) pie plate. Use the flat bottom of a measuring cup to compact it, especially where the base meets the sides. Bake for 8 minutes, then set the crust aside while you make the filling. Keep the oven on.
In a clean bowl, whisk the egg yolks for about 1 minute, until slightly thickened. Whisk in the sweetened condensed milk until smooth, then gradually whisk in the key lime juice and zest. The mixture will thicken as the acidic juice reacts with the milk; it still needs baking for safe setting.
Pour the filling into the warm crust and smooth the top. Bake for 12 minutes, until the edges look set and the center has a slight, even wobble rather than a liquid ripple. For egg-dish safety, check the center with an instant-read thermometer: the USDA FSIS safe minimum is 160°F (71°C). Avoid touching the crust with the probe.
Cool the pie on a rack for 1 hour, then cover loosely and refrigerate for at least 4 hours, until fully chilled and firm. Do not leave the pie at room temperature for more than 2 hours total, including serving time.
Just before serving, whip the cold cream with the powdered sugar and vanilla until it forms soft to medium peaks. Spread or pipe it over the pie and finish with a little lime zest. Slice with a clean knife, wiping the blade between cuts.

Tips

Key limes are small, tart, and aromatic, but can be hard to find. Bottled 100% key lime juice is a practical option; regular Persian lime juice works too, though its flavor is less floral and slightly different. Avoid sweetened lime cordial, which changes the balance.
Measure juice rather than relying on a lime count: fruit size and juiciness vary. Strain fresh juice to remove seeds and pulp, and zest only the colored surface, since the white pith can taste bitter.
Press the crust firmly into the plate, but do not pack it so aggressively that it becomes hard to cut. If the crumbs seem dry, add melted butter a teaspoon at a time; if they are greasy, mix in a tablespoon of crumbs.
Do not judge doneness by browning. The filling should remain pale and the center should wobble slightly; it firms as it cools. Overbaking can make the texture grainy or cause small cracks.

Serving Suggestions

Serve slices cold, with whipped cream added just before they reach the table. A light sprinkle of key lime zest adds fragrance; thin lime slices or a few berries make a simple garnish. The pie is rich and tart, so small slices pair well with unsweetened coffee or tea. For cleaner portions, chill the pie fully and use a long, sharp knife warmed under hot water and wiped dry between cuts.

Variations

For a slightly saltier, more toasted crust, replace up to half the graham cracker crumbs with finely crushed digestive biscuits or vanilla wafers; their sweetness and texture will change the crust modestly. A traditional-style meringue topping can replace whipped cream, but it needs its own properly cooked, safe preparation rather than simply topping the pie with raw egg whites. For a simpler finish, omit the topping and serve each slice plain. You can also use regular lime juice when key lime juice is unavailable, keeping the same measured quantity for a familiar, though less distinctly Key lime, flavor.

Storage and Reheating

Keep the pie covered and refrigerated at 40°F (4°C) or below, and eat it within 3 days for best texture. Refrigerate it within 2 hours of baking or serving; discard any pie left out longer than 2 hours, or 1 hour when the room is above 90°F (32°C). Do not reheat: this dessert is meant to be served chilled, and warming can soften the filling and whipped cream. For longer storage, freeze the pie without whipped cream, tightly wrapped, for up to 1 month. Thaw it overnight in the refrigerator and add fresh whipped cream before serving; freezing may make the filling slightly less silky.

Frequently Asked Questions

Can I use regular lime juice instead of key lime juice?
Yes. Use ½ cup (120 ml) freshly squeezed or bottled regular lime juice. The pie will still set, but the flavor will be less floral and characteristic of key limes. Do not substitute limeade or sweetened cordial without adjusting the recipe.

Do I have to bake the crust first?
Prebaking for 8 minutes helps the crumb crust hold together and keeps it crisp beneath the filling. Let it stand briefly while you mix the filling; it does not need to cool completely before you pour the filling in.

Why is my pie filling runny?
It may have been underbaked, not chilled long enough, or made with too little juice measurement accuracy. Bake until the center has a gentle wobble and reaches the USDA FSIS egg-dish minimum of 160°F (71°C), then chill for at least 4 hours. The pie will not become firm immediately out of the oven.

Can I make the pie ahead?
Yes. Bake and chill it a day ahead, keep it covered in the refrigerator, and add whipped cream shortly before serving. This gives the filling time to set while keeping the topping fresh.

Can I make it without eggs?
This particular recipe depends on egg yolks for its baked custard texture, so omitting them is not a reliable one-for-one change. Use a tested egg-free key lime pie recipe designed with an appropriate thickener rather than simply leaving the yolks out.

What size pie plate should I use?
A standard 9-inch (23 cm) pie plate is the right size for these quantities. A smaller plate may overflow, while a larger one makes a thinner crust and filling that may bake faster; check doneness by texture and temperature rather than time alone.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

Spotted an error? Tell us and we will correct it (corrections policy).