Creamy, tart Key lime filling in a graham cracker crust, topped with whipped cream — Florida's iconic dessert.
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.
Serves 8
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.
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.
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.
Cool at room temperature 30 minutes, then refrigerate at least 3 hours, ideally overnight, until fully chilled and set.
Whip cream with powdered sugar to soft peaks. Pipe or spread on the chilled pie. Garnish with lime zest twists and serve cold.
Real Key lime juice makes a difference — buy bottled Nellie & Joe's if fresh Key limes are unavailable.
The filling should be YELLOW, not green. Green Key lime pie contains food coloring — a Florida Keys faux pas.
Zesting the limes before juicing is much easier — zest first, then juice.
Freeze the pie for a Key lime pie bar — partially frozen slices are incredible on a hot summer day.
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.
Refrigerate up to 5 days covered. Freeze up to 1 month (without whipped topping) — thaw overnight in refrigerator.
Key lime pie was created in the Florida Keys in the late 19th century, when the Keys had no refrigeration and sweetened condensed milk (which didn't require refrigeration) was a staple. The pie is traditionally attributed to 'Aunt Sally,' the cook for Florida's first self-made millionaire, William Curry. The Florida Keys citrus industry made Key limes ubiquitous until a 1926 hurricane wiped out the groves.
Key limes are smaller, rounder, and far more aromatic than the Persian limes in most grocery stores, with thin yellow-green skins, more seeds, and an intense, almost floral tartness. That distinctive perfume is what defines the pie. Persian limes make a perfectly good pie that purists will call merely 'lime pie,' while bottled Key lime juice like Nellie & Joe's is the accepted shortcut even in the Florida Keys.
Technically no — the original Keys version relied entirely on the acid-protein reaction between lime juice and condensed milk to thicken the filling, with no oven involved. Modern recipes add a brief 15-minute bake at 325°F for two reasons: it pasteurizes the raw egg yolks for food safety, and it produces a firmer filling that slices cleanly instead of slumping. The short bake is strongly recommended.
Because that's exactly what it should be. Key lime juice is pale yellow, and a filling made with egg yolks and condensed milk bakes to a soft butter-yellow color. Green Key lime pie means food coloring was added, which the Florida Keys consider an unforgivable tell of an inauthentic pie. If your pie is yellow, congratulations — you made it right.
It's an ideal make-ahead dessert. The pie needs at least 3 hours of chilling anyway, and it's even better after a full night in the refrigerator, where it keeps up to 5 days covered. Hold off on the whipped cream until shortly before serving so it stays billowy. The unfrosted pie also freezes well for up to a month — thaw overnight in the fridge.
Per serving (350g / 12.3 oz) · 8 servings total
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