Kermit’s key lime pie is a Florida-style dessert with a crisp graham cracker crust and a tangy, creamy filling made with key lime juice, sweetened condensed milk, and egg yolks. A brief bake helps the filling set, while a long chill gives each slice a clean cut and balances its sweet-tart flavor.
Ingredients
- 1½ cups (150 g) finely crushed graham cracker crumbs
- ¼ cup (50 g) granulated sugar
- 5 tablespoons (70 g) unsalted butter, melted
- 4 large egg yolks, at room temperature
- 1 can (14 oz / 397 g) sweetened condensed milk
- ½ cup (120 ml) key lime juice, preferably fresh
- 1 teaspoon finely grated key lime zest, plus a little extra to garnish if desired
- 1 cup (240 ml) cold heavy whipping cream
- 2 tablespoons (15 g) confectioners’ sugar
- ¼ teaspoon vanilla extract
Instructions
- Heat the oven to 350°F (175°C). Set out a 9-inch (23 cm) pie plate. If using whole graham crackers, crush them to fine, even crumbs; a food processor is convenient, or place them in a sturdy bag and crush with a rolling pin.
- Stir the crumbs and granulated sugar together in a bowl. Pour in the melted butter and mix until all the crumbs look evenly damp. Press the mixture firmly over the base and up the sides of the pie plate. Use the bottom of a measuring cup to compact it, especially where the base meets the sides.
- Bake the crust for 8 minutes, then set it on a rack while you make the filling. Leave the oven on. The crust should smell toasted and feel set, not deeply browned.
- In a medium bowl, whisk the egg yolks for about 1 minute, until slightly thickened. Whisk in the sweetened condensed milk until smooth, then add the key lime juice and zest. Mix just until combined; the filling will thicken as the citrus reacts with the milk. Avoid prolonged beating, which can make the texture less even.
- Pour the filling into the warm crust and smooth the top. Bake for 12 minutes. The edges should look set and the center should still have a slight, gentle wobble. Because this filling contains eggs, check the center with a food thermometer: USDA FSIS guidance for egg dishes is a safe minimum internal temperature of 160°F (71°C). If it has not reached that temperature, continue baking in short intervals and check again.
- Cool the pie on a rack for about 1 hour, then cover loosely and refrigerate for at least 4 hours, or until thoroughly chilled and firm. Do not leave it at room temperature for more than 2 hours in total.
- Just before serving, whip the cold cream, confectioners’ sugar, and vanilla in a chilled bowl until soft or medium peaks form. Spread or pipe the cream over the pie. Finish with a little extra lime zest if you like, then slice with a clean knife.
Tips
- Use juice that tastes fresh. Key limes are small and can take many fruits to produce ½ cup (120 ml) of juice. Bottled key lime juice is a practical alternative; choose one labeled 100% juice, and expect a slightly different aroma. Regular Persian lime juice works too, but tastes a little less floral and more familiar.
- Measure the juice accurately. Too much can make the filling overly sharp or slow to set. If juicing fresh limes, strain out seeds and large pulp before measuring.
- Pack the crust firmly. Loose crumbs are more likely to crumble when sliced. Press the mixture evenly into the corners and sides, but don’t make the rim so thin that it burns before the filling is ready.
- Chill before cutting. The pie may seem set after baking, but it needs the refrigerator time to firm up. For neat slices, wipe the knife between cuts and keep the pie cold while serving.
Serving Suggestions
Serve slices cold, with the whipped cream on top or on the side. A fine sprinkle of lime zest gives a fresh, fragrant finish; a thin lime wheel is another simple garnish. The pie is rich and tart, so modest slices pair well with coffee, unsweetened tea, or fresh berries. Add the whipped cream shortly before serving so it stays light and attractive.
Variations
Regular lime version: Replace the key lime juice with the same amount of Persian lime juice. The result remains tangy, though its lime flavor is usually less floral. Make it without a topping: Leave off the whipped cream for a simpler, sharper slice, or serve a spoonful alongside each portion. Graham-cracker alternative: Use finely crushed digestive biscuits in the same quantity; because brands vary in sweetness, taste the crumb mixture before pressing it into the pan and reduce the crust sugar slightly if needed. Individual pies: Divide the crust and filling among 8 small oven-safe tart dishes. Bake until the centers reach 160°F (71°C), checking early because smaller portions may set faster, then cool and chill as directed.
Storage and Reheating
Refrigerate the pie within 2 hours of baking or serving, covered once cool. It keeps for up to 3 days in the refrigerator; the crust may soften gradually, and whipped cream is at its best when freshly added. Keep it refrigerated between servings and discard any portion left out at room temperature for more than 2 hours (or more than 1 hour in temperatures above 90°F / 32°C). This pie is served chilled, so reheating is not recommended. To freeze, wrap individual slices or the uncovered, unadorned pie tightly and freeze for up to 1 month for best texture. Thaw overnight in the refrigerator and add fresh whipped cream before serving.
Frequently Asked Questions
Can I use regular lime juice instead of key lime juice?
Yes. Use ½ cup (120 ml) of fresh regular lime juice. The pie will still set, but its flavor will be a little less floral and distinctive than one made with key limes.
Can I use bottled key lime juice?
Yes. Bottled 100% key lime juice saves time and is a reliable option when fresh key limes are hard to find. Use the same measured quantity; the exact flavor varies by product.
Why is my pie filling runny?
It may not have baked long enough, may not have reached the egg-dish safety temperature, or may not have chilled for the full 4 hours. Check the center temperature during baking, then chill the pie completely before slicing.
Can I make the pie ahead?
Yes. Bake and chill it a day ahead, keep it covered in the refrigerator, and add the whipped cream shortly before serving. This allows the filling to become firm without the topping sitting on it too long.
Do I need to separate the eggs?
Yes. The recipe uses the yolks in the filling; the whites are not needed. Separate eggs while cold, when the yolks are less likely to break, then let the yolks come to room temperature for easier mixing.
How do I know when the pie is done?
The outer portion should look set and the center should wobble only slightly. For this egg-based filling, use a food thermometer and follow USDA FSIS guidance: the center must reach 160°F (71°C). Avoid relying on appearance alone.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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