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Classic Key Lime Pie

A crisp graham crust and a tang-forward lime custard make this chilled pie bright, creamy, and neat enough to serve in clean slices.

A pale key lime pie with a golden graham crust, whipped cream, lime zest, and one clean slice removed.

This pie leans into lime rather than extra sweetness. Sweetened condensed milk gives the filling its familiar velvety body, while a generous measure of juice keeps the finish unmistakably tart. Key lime juice brings the classic aromatic edge, but ordinary Persian limes make a dependable substitute when used in the same amount.

Press for a crisp shell

Fine crumbs and thoroughly melted butter are what make the crust compact rather than sandy. Press it firmly along the base and sides, then bake it until it is dry to the touch; that brief bake keeps the custard from softening the shell.

Keep the custard smooth

Whisk the yolks and condensed milk smooth before the juice goes in, then stop baking while the center still moves slowly as one mass. Carryover heat finishes the set without pushing the filling toward a curdled or browned texture.

Glossy lime custard fills a baked golden graham cracker crust in a ceramic pie plate. — The lime custard is whisked glossy and smooth before it goes into the baked crumb shell.

Key limes or Persian limes

Key limes are smaller and more aromatic, so bottled Key lime juice can be a practical choice. If only Persian limes are available, juice them fresh and use the same amount; the pie will still be balanced, creamy, and briskly lime-forward.

Give the set time

The refrigerator is part of the recipe, not an optional pause. Chill until the custard is fully cold and firm before slicing; cutting early is the main reason a pie that looked set in the oven can slump on the plate.

A firm slice of key lime pie shows smooth pale filling, crisp graham crust, whipped cream, and lime zest. — A cold slice shows the clean custard edge, crumb crust, cloud of cream, and fresh lime zest.

Finish lightly

Whip the cream only to soft peaks with a restrained amount of confectioners' sugar. Spoon it on just before serving, then add the reserved zest for fragrance and a bright contrast to the pale filling.

Classic Key Lime Pie

8 slices

290 minutes total

Ingredients

• 1 1/2 cups finely ground graham cracker crumbs
• 3 tbsp granulated sugar
• 6 tbsp unsalted butter, melted
• 4 large egg yolks
• 1 14-oz can sweetened condensed milk
•
• 1 tbsp finely grated lime zest, divided
• 1 cup cold heavy cream
• 1 tbsp confectioners' sugar

Method

Heat the oven
Set a rack in the center of the oven and heat it to 350 F while you prepare a 9-inch pie plate. Use Key lime juice by default; use Persian lime juice in the same amount when unavailable.
Look for: The oven indicator shows that the oven is fully preheated.
Make the crust
Stir the graham cracker crumbs, granulated sugar, and melted butter until every crumb is moistened, then press firmly across the bottom and up the sides of the pie plate.
Look for: The crust looks evenly damp and holds together when pressed with the bottom of a measuring cup.
Bake and cool the crust
Bake the crust at 350 F until fragrant and lightly browned, then place the pie plate on a rack to cool while you make the filling.
Look for: The crust is dry to the touch and its edges are a shade darker than the center.
Mix the lime filling
Whisk the egg yolks and sweetened condensed milk until smooth, then whisk in the Key lime juice and all but a pinch of the lime zest; use Persian lime juice in the same amount if Key limes are unavailable.
Look for: The filling is glossy, uniform, and noticeably more fluid than it will be after baking.
Bake until just set
Pour the filling into the warm crust and bake at 350 F until the edges are set and the center has only a small, slow wobble when the plate is nudged.
Look for: The center moves as one soft mass rather than looking liquid, and the surface has no browning.
Chill until firm
Cool the pie on a rack until no longer warm, then refrigerate it uncovered until thoroughly cold and firm enough to cut into clean slices.
Look for: A thin knife drawn through the center leaves a clean, stable cut instead of a loose filling.
Whip the cream
Whip the cold heavy cream with the confectioners' sugar to soft peaks so it is lightly sweetened and still smooth enough to spoon over the pie.
Look for: The cream makes peaks that curl gently at their tips and does not look grainy.
Finish and serve
Cut the cold pie into slices, top each with whipped cream, and scatter the reserved lime zest over the cream just before serving.
Look for: Each slice holds a sharp edge and the fresh zest remains bright green on the cream.