Key lime pie is a Florida Keys classic: a tangy filling of lime juice, sweetened condensed milk, and egg yolks baked in a crisp graham cracker crust. This company-style version is smooth, sliceable, and finished with softly whipped cream; bottled Key lime juice makes it practical wherever fresh Key limes are hard to find.
Ingredients
- 1½ cups (150 g) finely crushed graham cracker crumbs, about 10–12 full cracker sheets
- 5 tablespoons (70 g) unsalted butter, melted
- ¼ cup (50 g) granulated sugar
- 4 large egg yolks (about 72 g), at room temperature
- 1 can (14 ounces / 396 g) sweetened condensed milk
- ½ cup (120 ml) Key lime juice, bottled or freshly squeezed
- 1 teaspoon finely grated Key lime zest, optional
- ¾ cup (180 ml) cold heavy whipping cream
- 1 tablespoon (8 g) powdered sugar
- ¼ teaspoon pure vanilla extract
- Thin lime slices or a little extra zest, for garnish, optional
Instructions
- Set a rack in the center of the oven and heat it to 350°F (175°C). Lightly butter a 9-inch (23 cm) pie plate. If using whole graham crackers, crush them to fine, even crumbs; larger pieces can make the crust crumble when sliced.
- Stir the crumbs, melted butter, and granulated sugar together until evenly moistened. Press the mixture firmly over the bottom and up the sides of the pie plate, using the bottom of a measuring cup to compact it. Bake for 10 minutes, then set the crust aside while you make the filling. Leave the oven on.
- In a medium bowl, whisk the egg yolks for about 1 minute, until slightly thickened. Whisk in the sweetened condensed milk, lime juice, and optional zest until smooth. Avoid vigorous beating, which can add excess air and leave bubbles in the baked filling.
- Pour the filling into the warm crust and smooth the top. Bake for 15 minutes, until the edges look set and the center still has a slight, gentle wobble when you nudge the pan. Do not wait for the center to become completely firm in the oven; it will set as it cools. The USDA FSIS safe minimum for egg dishes is 160°F (71°C); check the center with a food thermometer if you need to verify doneness.
- Cool the pie on a rack for 1 hour, then cover loosely and refrigerate for at least 4 hours, or until thoroughly cold and firm. Keep it refrigerated during this time; do not leave it at room temperature for more than 2 hours.
- Just before serving, whip the cold cream, powdered sugar, and vanilla in a chilled bowl until medium peaks form. Spread or pipe the cream over the pie. Garnish with lime slices or zest, slice with a clean knife, and serve cold.
Tips
- Choose the juice you can get. Bottled Key lime juice gives dependable tartness and is often easier to find. Fresh Key limes work too, but they are small and may take many fruits to yield ½ cup. Regular Persian lime juice is a practical substitute; it tastes a little less floral, so add zest for extra aroma.
- Press the crust firmly. Compact crumbs make a shell that holds together under the creamy filling. If the crust looks loose or patchy, press it again before baking, especially where the base meets the sides.
- Use the wobble as your visual cue. The center should jiggle slightly, not ripple like liquid. Overbaking can make the filling firm or develop small cracks; chilling completes the setting.
- Keep the pie cold. Whipped cream holds its shape best when the pie and cream are chilled. For cleaner slices, dip a sharp knife in warm water and wipe it dry between cuts.
Serving Suggestions
Serve narrow, cold slices after a rich meal; the tart filling and airy cream make a satisfying contrast. A little lime zest on top adds fragrance without making the pie more sour. For a simpler finish, leave off the whipped cream and offer it on the side. Coffee, black tea, or unsweetened iced tea pairs well with the sweetness.
Variations
Gingersnap crust: Replace the graham crumbs with 1½ cups (150 g) finely crushed gingersnap cookies. Because cookies vary in sweetness and fat, begin with 4 tablespoons (56 g) melted butter and add another tablespoon only if the crumbs will not clump when pressed.
Make it more lime-forward: Stir in up to 2 teaspoons additional finely grated zest. Zest only the colored outer peel, not the bitter white pith.
Skip the topping: Serve the pie plain or with a spoonful of whipped cream per slice. For a dairy-free topping, use a plant-based whipping product labeled for whipping; its flavor and firmness vary by brand.
Individual portions: Divide the crumb mixture among 8–10 muffin cups lined with paper cases, press into the bottoms, and bake for about 5 minutes. Add the filling and bake for roughly 10–12 minutes, checking for set edges and a slight center wobble. Chill fully before topping and serving.
Storage and Reheating
Refrigerate the pie within 2 hours of baking or serving, covered once completely cool. It keeps well for 3–4 days in the refrigerator; the crust gradually softens, and whipped cream may lose definition. For the neatest presentation, store the pie and whipped cream separately and top it shortly before serving. This pie is served chilled, so reheating is not recommended. To freeze, wrap an un-topped, fully chilled pie tightly and freeze for up to 1 month for best quality. Thaw overnight in the refrigerator, then add freshly whipped cream. Do not thaw it on the counter.
Frequently Asked Questions
Can I use regular lime juice instead of Key lime juice?
Yes. Use the same amount of fresh or bottled Persian lime juice. The flavor will be a little less aromatic and may taste less distinctly tart; a teaspoon of finely grated lime zest helps bring out the citrus character.
Why is my filling still soft?
It may need more chilling, or it may have been underbaked. Give it at least 4 hours in the refrigerator; overnight is fine. If it remains loose after chilling, check your oven temperature and bake the next pie until the edges are set with only a slight wobble in the middle.
Do I need to cook the crust before adding the filling?
Yes. A 10-minute bake helps the butter bind the crumbs and keeps the base crisper beneath the moist filling. Let the crust stand briefly while you mix the filling, then fill and bake as directed.
Can I make the pie ahead?
Yes. Bake and chill it a day ahead, then keep it covered in the refrigerator. Whip and add the cream just before serving for the freshest texture and appearance.
Can I make this without eggs?
This recipe depends on egg yolks for its classic baked texture, so simply omitting them will not work. Use a tested egg-free Key lime pie recipe designed with an appropriate thickener rather than changing this filling by guesswork.
How do I know the pie is safe to serve?
Egg dishes should reach the USDA FSIS safe minimum of 160°F (71°C). Check the center with a food thermometer if you want a measured confirmation, then cool promptly and refrigerate within 2 hours.
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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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