This 3-ingredient key lime pie is exactly what my aunt brings to our first cookout of the season every year. It’s unfussy, refreshingly tart, and comes together in minutes, then chills while you fire up the grill. While traditional Key lime pie from Florida often involves separate steps for the crust and a meringue or whipped topping, this version leans into pantry shortcuts and keeps the focus on that silky, pale greenish-yellow citrus filling in a crumbly crust—perfect for any warm-weather weekend spread.
Serve this key lime pie well-chilled, straight from the foil pie tin, with a sharp knife for clean slices. It pairs beautifully with grilled chicken, burgers, or brats, and a simple side of fresh berries or a fruit salad balances the richness. I like to offer iced tea, sparkling water with lime wedges, or a crisp white wine alongside. For a cookout dessert table, set the pie next to a bowl of lightly sweetened whipped cream so guests can add a dollop if they like, but it’s lovely on its own.
3-Ingredient Key Lime PieServings: 8
Ingredients
1 (9-inch) prepared graham cracker crust in a foil pie tin
1 (14-ounce) can sweetened condensed milk
3/4 cup key lime juice (bottled or freshly squeezed), plus a little extra if you like it very tart
Directions
Place the prepared graham cracker crust, still in its foil pie tin, on a small baking sheet for easy handling. This also helps keep the crust level while the filling sets.
In a medium mixing bowl, whisk together the sweetened condensed milk and 3/4 cup key lime juice until the mixture is completely smooth and slightly thickened. Taste and, if you prefer a sharper lime flavor, whisk in an extra tablespoon or two of key lime juice.
Pour the lime filling into the graham cracker crust, using a spatula to smooth the top so it’s level and even. The filling should look pale greenish yellow and glossy.
Refrigerate the pie, uncovered, for at least 4 hours, or until the filling is fully set and firm to the touch in the center. For a cleaner slice at a cookout, overnight chilling is ideal.
Once the filling is set, slice the pie directly in the foil tin with a sharp knife, wiping the blade between cuts for neat wedges. Serve chilled and return any leftovers promptly to the refrigerator.
Variations & Tips
If you’d like a softer, mousse-like texture, gently fold 1 cup of lightly whipped heavy cream into the lime and condensed milk mixture before pouring it into the crust—this will make the pie slightly less tart and a bit lighter. For a more traditional Key lime color, you can whisk in 1–2 drops of green food coloring, but it’s entirely optional; the natural pale greenish-yellow is classic. If you prefer a stronger citrus profile, try replacing 2 tablespoons of the key lime juice with fresh lemon juice for a brighter, more complex acidity. For a party, you can divide the filling among mini graham cracker crusts in individual foil tins; the chilling time will shorten to about 2 hours. Food safety tips: Always keep the pie refrigerated until serving, and don’t leave it out at a warm-weather cookout for more than 2 hours (1 hour if it’s very hot outside) to maintain quality and safety. Use pasteurized bottled key lime juice or thoroughly washed fresh limes if squeezing your own. Store leftovers tightly wrapped in the refrigerator and enjoy within 3–4 days for best texture and flavor.
