Hummingbird Bakery-style key lime pie pairs a crisp digestive-biscuit crust with a tangy, creamy filling made from lime juice, condensed milk, and egg yolks. Baked until just set, chilled, and finished with whipped cream, it is a bright dessert inspired by the classic American pie; this version uses regular Persian limes when Key limes are hard to find.
Ingredients
- 1¾ cups (175 g) finely crushed digestive biscuits or graham crackers
- 6 tablespoons (85 g) unsalted butter, melted
- 2 tablespoons (25 g) granulated sugar
- 4 large egg yolks (about 72 g), preferably at room temperature
- 1 can (14 oz / 397 g) sweetened condensed milk
- ½ cup (120 ml) fresh Key lime juice, or regular lime juice
- 1 tablespoon finely grated lime zest (about 2 g), plus a little extra to garnish
- ¾ cup (180 ml) cold heavy cream
- 1 tablespoon (8 g) confectioners’ sugar
- ½ teaspoon vanilla extract (2.5 ml)
Instructions
- Prepare the pan and oven. Heat the oven to 350°F (175°C). Set a 9-inch (23 cm) pie dish on a baking sheet. The baking sheet makes the dish easier to move and catches any butter that escapes the crust.
- Make the crust. Stir the biscuit crumbs, melted butter, and granulated sugar in a bowl until all the crumbs are evenly damp, like wet sand. Press the mixture firmly over the base and up the sides of the pie dish, using the bottom of a measuring cup to compact it. Bake for 8 minutes, then set the crust aside to cool slightly while you mix the filling.
- Mix the filling. Whisk the egg yolks in a medium bowl until smooth. Whisk in the condensed milk, lime juice, and zest until the mixture is uniform and slightly thickened. Pour it into the warm crust and smooth the surface. Avoid whipping in excess air, which can leave bubbles in the finished pie.
- Bake until just set. Bake for 12 minutes. The filling should look set around the edges and still have a slight, gentle wobble in the center; it will firm as it cools. Because the filling contains eggs, check the center with a food thermometer: the USDA FSIS safe minimum for egg dishes is 160°F (71°C). If it has not reached that temperature, bake in 2-minute increments and check again. Do not wait for the surface to brown.
- Cool and chill. Let the pie cool on a rack for about 1 hour, then cover it without touching the surface and refrigerate for at least 4 hours, or until thoroughly cold and firm. This chilling time is important for clean slices.
- Whip the cream and serve. Just before serving, whip the cold heavy cream with the confectioners’ sugar and vanilla to soft or medium peaks. Spoon or pipe it over the pie and add a little lime zest. Slice with a warm, dry knife, wiping the blade between cuts.
Tips
- Measure juice rather than counting limes. Fruit size and juiciness vary. Measure ½ cup (120 ml); for a stronger citrus aroma, add zest rather than extra juice, which can make the filling too loose.
- Choose your crumb texture. Crush biscuits finely for a crust that holds together. A food processor is convenient, but a sealed bag and rolling pin work too. Press firmly, especially where the base meets the sides.
- Use room-temperature yolks. They blend more readily with the condensed milk. Separate eggs while cold, then let the yolks sit out briefly; do not leave eggs at room temperature for more than 2 hours.
- Keep the wobble modest. A slight center wobble is right, but a liquid center needs more oven time and a thermometer check. The pie firms during cooling and chilling; do not cut it warm.
Serving Suggestions
Serve the pie well chilled, with a modest cap of softly whipped cream so the lime filling remains the focus. Add a few curls of lime zest or a thin lime wheel to each slice. Fresh berries, such as raspberries or blueberries, make a pleasant tart-sweet accompaniment. For a neat dessert-course portion, cut eight slices and offer coffee or unsweetened tea alongside.
Variations
Key limes are small, aromatic limes associated with Florida’s version of this pie. If they are unavailable, regular Persian limes work well and taste a little less floral; use the same measured amount of juice and zest. Graham crackers can replace digestive biscuits directly, while plain vanilla wafers make a sweeter, softer-tasting crust. For a more pronounced citrus note, add another teaspoon of finely grated zest, but keep the juice quantity unchanged. You can also leave off the whipped cream and serve each slice with a small spoonful on the side.
Storage and Reheating
Refrigerate the pie within 2 hours of baking, covered once it is cool, and keep it at 40°F (4°C) or colder. It keeps for 3 to 4 days; for the best crust texture, add the whipped cream shortly before serving. Do not leave slices at room temperature for more than 2 hours, or 1 hour if the temperature is above 90°F (32°C). This is a chilled custard pie and is not meant to be reheated. You can freeze the un-topped pie, tightly wrapped, for up to 1 month; thaw it overnight in the refrigerator and add freshly whipped cream after thawing. The crust may soften slightly after freezing.
Frequently Asked Questions
Can I use bottled lime juice?
Fresh juice gives the cleanest flavor, especially in a pie with so few ingredients. Bottled juice can work if necessary, but its flavor may taste flatter or sharper. Avoid sweetened lime cordial, which changes the balance and adds sugar.
Why did my filling crack?
Cracks often appear when the pie is baked too long or cools too quickly. Take it out when the center has a gentle wobble and meets the required safe temperature; cool it gradually on a rack before refrigerating. A little whipped cream also neatly covers minor cracks.
Can I make the pie ahead?
Yes. Bake and chill it a day ahead, keeping it covered in the refrigerator. Add the whipped cream and garnish close to serving so the topping stays fluffy and the zest looks fresh.
How do I know it is set without overbaking?
The edges should look firm, while the center moves slightly when the dish is nudged. Since the filling contains egg yolks, use a food thermometer to verify 160°F (71°C), the USDA FSIS safe minimum for egg dishes. The filling will become firmer as it cools.
Can I make it without eggs?
This recipe relies on egg yolks for its baked custard texture, so simply omitting them will not set the filling. Use a specifically developed egg-free key lime pie recipe with an appropriate thickener rather than changing this formula by guesswork.
What can I use instead of a pie dish?
A 9-inch (23 cm) tart pan can work, though a removable base may make the pie more delicate to lift. Press the crust evenly into the pan and place it on a baking sheet. A smaller or deeper pan changes the filling depth and baking time, so check the center temperature and texture rather than relying only on the stated minutes.
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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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