How to Make Key Lime Pie — The Authentic Florida Keys Recipe

Overview

Learn to make an authentic Florida Keys Key Lime Pie from scratch, featuring a graham cracker crust, a five-ingredient condensed milk filling, and fresh Key lime juice and zest. This video covers historical insights, precise techniques, and common pitfalls to avoid for a perfect, pale-yellow pie.

Ingredients

• 1 1/2 cups graham cracker crumbs
• 1/3 cup granulated sugar (for crust)
• 6 tablespoons melted unsalted butter
• 4 large room-temperature egg yolks
• 1 14-ounce can sweetened condensed milk
• 1 tablespoon Key lime zest
• 1/2 cup fresh Key lime juice
• Tiny pinch of salt (for filling)
• 1 cup cold heavy cream (for whipped cream topping, optional)
• 2 tablespoons powdered sugar (for whipped cream topping, optional)
• 1/2 teaspoon vanilla (for whipped cream topping, optional)
• 4 egg whites (for meringue topping, optional)
• 1/2 cup granulated sugar (for meringue topping, optional)
• 1/4 teaspoon cream of tartar (for meringue topping, optional)

Instructions

1. Preheat oven to 350°F (175°C).
2. In a bowl, combine graham cracker crumbs, 1/3 cup granulated sugar, and melted unsalted butter; mix with fingers until it resembles wet beach sand.
3. Press the crumb mixture firmly and evenly up the sides and bottom of a 9-inch pie plate, using the flat bottom of a measuring cup to pack it.
4. Bake the crust for 8 to 10 minutes, then cool for 10 minutes before filling.
5. In a stainless mixing bowl, whisk 4 room-temperature egg yolks by hand for 2 minutes until they become paler and slightly thicker.
6. Add the full 14-ounce can of sweetened condensed milk and 1 tablespoon of Key lime zest to the yolks, and whisk for 30 seconds.
7. Slowly pour in 1/2 cup of fresh Key lime juice while continuously whisking, and whisk for 1 more minute.
8. Pour the filling immediately into the warm, prebaked crust.
9. Bake the filled pie on the middle rack at 350°F (175°C) for 15 to 17 minutes, until the edges are set and slightly puffed, and the center still wobbles like firm Jell-O in a 4-inch circle.
10. Remove the pie from the oven and cool on the counter for 1 hour.
11. Refrigerate the pie for at least 3 hours, ideally overnight; leave it uncovered for the first hour of chilling, then loosely cover.
12. To prepare whipped cream topping (optional): Whip 1 cup cold heavy cream with 2 tablespoons powdered sugar and 1/2 teaspoon vanilla to medium-stiff peaks, then dollop on each cold slice.
13. To prepare torched meringue topping (optional): Whip 4 egg whites with 1/2 cup granulated sugar and 1/4 teaspoon cream of tartar to stiff, glossy peaks, swirl over the chilled pie, then brulee with a kitchen torch for about 30 seconds until peaks are dark golden brown.
14. Slice the cold pie with a hot, wet knife, wiping it clean between every cut, and serve straight from the fridge.

In this video

• Key Lime Pie was born in Key West around 1856, after the patenting of sweetened condensed milk made it possible.
• The original Key Lime Pie recipe chemically set the custard without an oven, using canned milk and natural lime acid.
• Florida officially designated Key Lime Pie as the state pie in 2006.
• A true Key lime is small, about the size of a ping-pong ball, with pale yellow flesh, and provides a more aromatic and floral juice than a Persian lime.
• Approximately 20 to 25 Key limes are needed to yield one half cup of juice.
• The zest carries 70 percent of the Key Lime Pie's flavor, making it crucial not to skip this ingredient.
• The pie filling should be baked for 15 to 17 minutes until the center wobbles like a firm Jell-O in a 4-inch circle.
• After baking, the pie must cool for one hour on the counter and then refrigerate for at least three hours to ensure it sets properly.
• Authentic Key Lime Pie is pale yellow, and green food coloring often indicates the use of bottled Persian juice.
• Traditional Key Lime Pie is often topped with torched meringue, though whipped cream is also a correct and popular modern choice.

Frequently asked questions

When was Key Lime Pie invented?

Key Lime Pie was invented in Key West around 1856, shortly after sweetened condensed milk was patented, which was essential for the recipe as there was no fresh dairy on the island.

What kind of limes should I use for Key Lime Pie?

For an authentic pie, use true Key limes, which are small, pale yellow, and yield aromatic, floral, and slightly bitter juice. Avoid using bottled green plastic-bottle juice as it tastes like dish soap.

How many Key limes are needed for a recipe?

You will need about 20 to 25 small Key limes to obtain one half cup of fresh Key lime juice for the pie filling.

What are common mistakes to avoid when making Key Lime Pie?

Avoid adding green food coloring, overbaking the pie past 18 minutes, using cold ingredients instead of room temperature, under-zesting, and slicing the pie before it has fully chilled for at least three hours.

What is the traditional topping for Key Lime Pie?

The traditional topping for Key Lime Pie is torched meringue, made from egg whites, granulated sugar, and cream of tartar, though whipped cream is also a popular and acceptable modern option.