Mama refuses to host Sunday dinner unless I bring this with me. Takes just 3 ingredients to make.

This southern 3-ingredient lemon icebox pie is the kind of recipe that gets you invited back—my own mother won’t host Sunday dinner unless I show up with one of these in hand. It’s a classic Southern-style icebox dessert: a tangy, creamy lemon filling in a buttery graham cracker crust, chilled until firm and sliceable. The style dates back to the era when home cooks relied on their “icebox” instead of an electric refrigerator and leaned on pantry staples like canned milk and citrus. The beauty here is its simplicity: no eggs, no stovetop, no mixer required—just whisk, pour, and chill.

Serve this pie well-chilled, straight from the refrigerator, with a sharp knife wiped clean between slices for neat wedges. It pairs nicely with hot coffee after a rich Sunday supper, or with iced tea if you’re leaning into the Southern theme. Add a handful of fresh berries on each plate if you’d like a little color and contrast, or keep it plain to let the lemon shine. Because it’s rich but refreshing, it’s an ideal finish after barbecue, fried chicken, or any hearty comfort meal.

Servings: 8

1 (9-inch) prepared graham cracker pie crust

Place the prepared graham cracker pie crust on a small sheet pan or plate so it’s easy to move in and out of the refrigerator without cracking the crust.

In a medium mixing bowl, whisk together the sweetened condensed milk and freshly squeezed lemon juice until the mixture is completely smooth, thick, and uniform in color. This should take about 1–2 minutes by hand; the filling will noticeably thicken as the lemon juice reacts with the milk.

Taste the filling and adjust if desired by adding a teaspoon or two more lemon juice for extra tang, whisking again to fully incorporate.

Pour the lemon filling into the graham cracker crust, using a spatula or the back of a spoon to spread it evenly all the way to the edges. Smooth the top so you have a level, creamy surface; this helps it chill evenly and makes for a clean, attractive finish in the glass pie plate.

Gently tap the pie plate on the counter a few times to release any large air bubbles trapped in the filling.

Refrigerate the pie, uncovered, for at least 4 hours, or until the filling is fully set and firm enough to slice cleanly. For the best texture and flavor, chill it overnight.

Once the pie is well-chilled and set, slice into 8 wedges using a sharp knife. Wipe the knife with a warm, damp cloth between cuts for tidy slices that show off the pale yellow filling against the golden crumb crust.

Serve the pie straight from the refrigerator. Return any leftovers to the fridge promptly, loosely covered, and enjoy within 3–4 days for the best flavor and texture.

For a stronger citrus punch, substitute up to 2 tablespoons of the lemon juice with freshly squeezed lime juice or bottled key lime juice; you’ll still keep the three-ingredient structure while shifting the flavor profile slightly. If you prefer a sweeter, less tangy pie, reduce the lemon juice to 2/3 cup and whisk thoroughly until thickened. To play with texture, choose a different ready-made crust while staying within the three-ingredient limit: a vanilla wafer crust or shortbread crust both complement the lemon filling beautifully. If your crust is labeled “extra-large” or “deep dish,” you can increase the lemon juice to a full cup to ensure the filling reaches higher up the sides. For a slightly firmer slice that travels well to potlucks or Sunday dinners, chill the pie overnight and keep it in the coldest part of your refrigerator until just before serving. Finally, if you’re cooking in a very warm kitchen, chill the cans of sweetened condensed milk before mixing; starting cold helps the filling set up faster and gives you that smooth, pale yellow finish you see in classic icebox pies.