Authentic Key Lime Pie

About This Recipe

Key lime pie is Florida's state pie and one of America's greatest regional desserts — a cool, intensely tart and creamy custard set in a buttery graham cracker crust. The Key lime, a small, fragrant citrus native to the Florida Keys, has an exceptional balance of tartness and floral aroma that regular lime cannot fully replicate, though Persian limes work reasonably well outside the Keys. The genius of Key lime pie is its simplicity and the science within it: Key lime juice, sweetened condensed milk and egg yolks combine to create a filling that sets without baking through an acid-protein reaction. Traditionalists argue no baking is needed, though most modern recipes call for a brief bake at low temperature to ensure food safety and a firmer set. The result should be pale yellow (never green — authentic Key lime juice is pale yellow) and intensely tart-sweet. Serve chilled with billows of freshly whipped cream (never canned) and a few twists of lime zest. Key lime pie should make your mouth water with its tartness before you even take a bite. It is the perfect dessert after rich food, cutting through with bright, clean acidity. And it is one of the easiest pies in the American repertoire — no lattice work, no blind baking required, just mix, pour and chill.

Ingredients

Serves 8

• 1½ cupsgraham cracker crumbs
• ⅓ cupgranulated sugar(for crust)
• 6 tbspunsalted butter(melted)
• 4egg yolks
• 2 tspKey lime zest(or regular lime zest)
• ⅔ cupKey lime juice(fresh squeezed, about 25–30 Key limes)
• 2 cans (14 oz each)sweetened condensed milk
• 1½ cupsheavy whipping cream(for topping)
• 2 tbsppowdered sugar

Instructions

1. 1

   Make and bake the crust

   Mix graham crumbs, sugar and butter. Press firmly into a 9-inch pie plate. Bake at 350°F for 8 minutes until set. Cool completely.

2. 2

   Make the filling

   Beat egg yolks and lime zest with a mixer 5 minutes until pale and thick. Add sweetened condensed milk and beat 3 minutes. Add lime juice on low and mix until combined.

   The lime juice will thicken the filling through its acid reaction with the condensed milk proteins.

3. 3

   Bake

   Pour filling into cooled crust. Bake at 325°F for 15 minutes until just set at the edges with a very slight jiggle at center.

4. 4

   Cool and chill

   Cool at room temperature 30 minutes, then refrigerate at least 3 hours, ideally overnight, until fully chilled and set.

5. 5

   Top and serve

   Whip cream with powdered sugar to soft peaks. Pipe or spread on the chilled pie. Garnish with lime zest twists and serve cold.

Variations

• •

  Key Lime Bars: press the same filling into a brownie pan over a shortbread base for portable bars.

• •

  Key Lime Cheesecake: add 16 oz cream cheese to the filling for a denser, richer dessert.

• •

  Frozen Key Lime Pie: freeze after adding whipped cream topping for a semi-freddo style pie.

Storage

Refrigerate up to 5 days covered. Freeze up to 1 month (without whipped topping) — thaw overnight in refrigerator.

Frequently Asked Questions