Martha Stewart's Key Lime Pie Recipe: Zesty Tartness With Graham Cracker Crust

Martha Stewart’s key lime pie recipe delivers the perfect balance of zesty tartness and creamy texture that makes this dessert legendary. The graham cracker crust provides a sturdy foundation, while the lime custard filling—brightened with fresh lime juice and sweetened just enough—creates that signature tang.

I’ve tested countless variations, and this method ensures the meringue topping stays perfectly golden and crisp, not too sweet. Every slice reveals a velvety filling with a hint of lime zest on top, making it a showstopper for any dessert table.

What sets this recipe apart is Martha Stewart’s signature attention to detail, from precise measurements to proper chilling times. The crust is made with graham cracker crumbs and butter, baked until just set, while the filling requires careful tempering of the eggs to avoid scrambling.

The meringue topping, whipped to soft peaks, is spread evenly and torched for a glossy finish. This isn’t just dessert—it’s a labor of love that tastes like a professional bakery.

The result is a pie that’s creamy yet bright, with a tartness that lingers just enough to refresh your palate. The graham cracker crust adds a subtle sweetness, while the meringue topping provides a satisfying crunch.

Chilling for at least four hours ensures the filling sets properly, making each slice clean and elegant. Whether you’re serving it at a holiday gathering or simply craving a taste of the tropics, this recipe delivers every time.

For the perfect presentation, garnish with extra lime zest or a dollop of whipped cream before serving. The contrast of colors—bright green lime, golden meringue, and golden crust—makes it as visually appealing as it is delicious.

This is the key lime pie Martha Stewart would serve, and it’s worth every step of the process.

Ingredients for key lime pie martha stewart

These ingredients create Martha Stewart's legendary key lime pie with perfect tartness and texture.

The graham cracker crumbs are non-negotiable—Honey Maid or Keebler are the gold standard, but any sturdy graham crackers work if crushed finely. For the crust, cold butter is essential; let it sit out just until soft before mixing. If you can't find key limes, Mexican limes or Persian limes work perfectly—they're just as tart. The lime zest needs to be fresh; store-bought zest often lacks the bright flavor. For the custard, room-temperature eggs temper better and prevent scrambling. If you're short on time, Walmart or Target usually carry key limes year-round, but check the produce section early in the morning for the freshest ones.

No key limes? Lemon juice with extra zest mimics the tartness, though it won't be identical. For the meringue, turbinado sugar adds a subtle crunch if you prefer texture. If your eggs are cold, warm them under lukewarm water for 5 minutes—this makes all the difference in a silky custard. The vanilla extract should be pure, not imitation; Nielsen-Massey or McCormick are reliable brands. For a dairy-free option, substitute the heavy cream with full-fat coconut milk, though the texture will be slightly lighter. If you're making this ahead, prep the crust and filling separately—they keep well in the fridge for up to 24 hours before assembly.

The crust should be baked until just set—about 12-15 minutes at 350°F—and then cooled completely before adding the filling. The custard thickens as it chills, so it's best to whisk it one last time before pouring into the crust. For the meringue, spread it evenly to the edges to prevent sinking; a kitchen torch gives the glossy finish Martha Stewart is known for, but a broiler works in a pinch. Once assembled, the pie needs at least 4 hours in the fridge to set properly. Store leftovers covered in the fridge for up to 3 days, though it's best enjoyed fresh. The meringue can be torched just before serving for that restaurant-quality shine.

Step-by-step instructions for Martha Stewart's key lime pie

Here's the method that delivers Martha Stewart's signature tartness and creamy perfection.

Preheat your oven to 350°F. In a medium bowl, combine the 2 cups graham cracker crumbs with the 0.5 cup unsalted butter. The butter should be cold and cubed - this ensures the crust stays crisp rather than greasy. Use your fingers or a fork to work the butter into the crumbs until the mixture resembles wet sand.

Press the crumb mixture firmly and evenly into a 9-inch pie dish, creating an even layer about ¼-inch thick. Use a glass to compact the crust, especially along the edges. Bake for 10-12 minutes until the edges are lightly golden. Let it cool completely before adding the filling - this prevents the crust from becoming soggy when the warm custard is poured in.

In a medium saucepan, whisk together the 4 whole large eggs, 1 cup heavy cream, 1 cup fresh key lime juice, 2 tbsp lime zest, 1.5 cups granulated sugar, and 0.5 tsp salt. The mixture should be smooth - if you notice any lumps, strain it through a fine-mesh sieve before proceeding.

Cook over medium-low heat, stirring constantly with a wooden spoon or silicone spatula, until the mixture thickens enough to coat the back of a spoon (about 8-10 minutes). This is where attention matters most - the custard should thicken gradually without curdling. If it starts to bubble or separate, immediately reduce the heat to the lowest setting and continue stirring gently.

Once thickened, remove from heat and stir in the 2 tbsp cornstarch and 1 tsp vanilla extract. The cornstarch helps stabilize the filling and prevents it from weeping later. Let the mixture cool to room temperature before pouring it into the cooled crust - this prevents the crust from absorbing too much moisture and becoming soggy.

Pour the cooled key lime filling into the prepared crust, spreading it evenly with a spatula. The filling should reach just below the top edge of the crust. Place the pie on a baking sheet (to catch any potential drips) and bake at 325°F for 40-45 minutes until the filling is set but still slightly jiggly in the center. This ensures a perfect custard texture rather than a firm, rubbery center.

Remove from the oven and let it cool completely to room temperature. This cooling step is critical - it allows the filling to fully set and prevents the meringue from sliding off later. Once cooled, refrigerate the pie for at least 4 hours or overnight to allow the flavors to meld and the texture to firm up.

When ready to serve, preheat your oven to 350°F. In a clean, grease-free bowl, beat the 4 whole egg whites with an electric mixer on medium speed until soft peaks form. Gradually add the 0.5 cup granulated sugar, 1 tbsp at a time, beating well after each addition. Increase the speed to high and beat until the meringue is stiff, glossy, and holds firm peaks.

Spread the meringue evenly over the pie, sealing it to the crust edges to prevent weeping. Bake for 8-10 minutes until the meringue is lightly golden. Watch carefully - it's easy to overbake. Let the pie cool completely before slicing to allow the meringue to set properly.

Return the pie to the refrigerator and chill for at least 2 hours before serving. This final chilling step ensures clean slices and allows the flavors to fully develop. When ready to serve, run a thin knife around the edge of the pie to loosen it from the dish. Slide a spatula under the pie and transfer it to a serving plate.

Slice with a warm knife (dip it in hot water and wipe dry between cuts) for clean, precise portions. Each slice should reveal a vibrant yellow filling with a bright, tangy key lime flavor perfectly balanced by the sweet meringue topping. The crust should be crisp and the filling should be creamy yet firm - a true Martha Stewart signature.

Creative variations of this dish

Tropical Twist

Add ½ cup toasted coconut flakes to the graham cracker crust before baking for a nutty, tropical depth. I mix in 1 tbsp toasted coconut milk powder with the lime zest in the filling for an extra layer of complexity.

Garnish with extra toasted coconut and a sprinkle of crushed macadamia nuts before chilling for a luxurious finish. 🌴

Spiced Rum Infusion

For a boozy twist, stir 1 tbsp spiced rum (like Bacardi Oakheart) into the warm custard just before pouring it into the crust. The rum adds warmth that complements the tart lime beautifully.

I also like adding a pinch of cinnamon and nutmeg to the crust for a cozy spice note. 🍹

Chocolate-Dipped Variation

After baking the meringue topping, dip the edges in melted dark chocolate (70% cacao or higher) for a decadent contrast. Let it set slightly before returning to the fridge. This adds a sophisticated touch that pairs perfectly with the bright lime flavors. 🍫

Ginger-Lime Zing

Boost the filling with 1 tbsp fresh grated ginger and an extra ½ tsp lime zest for a spicy-sweet balance. The ginger enhances the lime's brightness while adding a subtle kick. I also like adding a pinch of cardamom for an exotic touch that works surprisingly well. 🌶️