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The word icebox gives away the age of whoever says it, and this pie comes from the same era: a time when the refrigerator ran on a block of ice a man carried to the door, and dessert had to be something that set in the cold without much help. Lemon icebox pie needs a graham cracker crust, a can of sweetened condensed milk, egg yolks and fresh lemon juice. That is nearly the whole list.
What makes it work is chemistry that the original cooks did not need to understand. Lemon juice whisked into sweetened condensed milk thickens it on its own within a minute, so the filling is almost set before it sees the oven. A short bake, about twelve minutes, cooks the egg yolks through. Then the cold does the rest, and after four hours the pie slices as clean as a cheesecake. Fresh lemons, not bottled juice, are the one thing not to skip.
Why this lemon icebox pie works
- Condensed milk and lemon. The acid thickens the milk instantly, giving a silky filling with no cornstarch and no cooking on the stove.
- Egg yolks only. Yolks add richness and let the filling set firm; the whites would make it rubbery.
- A short bake. Twelve minutes sets the yolks without curdling the filling.
- Real lemons. Three lemons, squeezed by hand, plus their zest. Bottled juice makes a flat pie.
Ingredients
Makes one 9-inch pie, 8 slices. US cups with grams in brackets.
For the crust
- 1 1/2 cups graham cracker crumbs (150g, about 10 sheets)
- 1/3 cup unsalted butter (75g), melted
- 3 tablespoons granulated sugar
For the filling
- 1 can (14 ounces, 397g) sweetened condensed milk
- 3 large egg yolks
- 1/2 cup fresh lemon juice (120ml, about 3 lemons)
- Finely grated zest of 1 lemon
For the top
- 1 cup heavy cream (240ml)
- 2 tablespoons powdered sugar
- Thin lemon slices (optional)
Use full-fat sweetened condensed milk, not evaporated milk; they are different products and evaporated milk will not set.
How to make lemon icebox pie
The crust
- Heat the oven to 350°F (175°C). Stir the graham cracker crumbs, melted butter and sugar together until the crumbs are evenly moistened.
- Press firmly into the bottom and up the sides of a 9-inch pie plate, using the bottom of a measuring cup. Bake for 8 minutes. Cool slightly. Lower the oven to 325°F (165°C).
The filling
- In a bowl, whisk the condensed milk and egg yolks together until smooth.
- Add the lemon juice and zest and whisk for about a minute. The mixture will thicken noticeably as you whisk. That is the reaction you want.
- Pour the filling into the crust and smooth the top. Bake at 325°F for 12 to 14 minutes, until the filling is set at the edges and barely wobbles in the center.
- Cool on a rack for 1 hour, then refrigerate for at least 4 hours, preferably overnight.
The top
- Just before serving, whip the cream with the powdered sugar to soft peaks. Spread or pipe it over the pie and add the lemon slices. Slice with a knife dipped in hot water and wiped between cuts.
Tips that make the difference
- Zest the lemons before juicing; it is impossible afterward.
- Roll the lemons hard on the counter before cutting to get more juice.
- For a pie that slices perfectly, chill it overnight and top it only when serving.
- A pinch of salt in the crust makes the filling taste sharper.
Variations
- Lime icebox pie. The same recipe with lime juice and zest; with small key limes it is key lime pie.
- Meringue top. Whip the 3 leftover egg whites with 6 tablespoons sugar to stiff peaks, spread over the baked filling and bake 10 minutes more at 350°F.
- Vanilla wafer crust. Crushed vanilla wafers instead of graham crackers, the way many Southern cooks made it.
- No-bake. Skip the oven for the filling: use pasteurized yolks, whisk as written, and chill 6 hours. The texture is softer.
Storage and make-ahead
Cover loosely and refrigerate for up to 4 days. Add the whipped cream only to the slices being served.
The pie freezes well without the cream, wrapped tightly, for 2 months. Thaw in the refrigerator overnight, or serve it half-frozen on a hot day, which is how some families always ate it.
Frequently asked questions
Why is it called icebox pie?
Because it sets in the cold, and the cold in an old kitchen was the icebox: a wooden cabinet cooled by a block of ice delivered to the door. The name stayed long after the refrigerator arrived.
Can I use bottled lemon juice?
It will set, but the flavor is flat and slightly bitter. Three fresh lemons make the difference between a good pie and a memorable one.
Why did my filling not set?
Either evaporated milk was used by mistake, or the pie did not chill long enough. The filling needs a full 4 hours in the refrigerator after baking. It will also set softer if the lemon juice was reduced.
Do I have to bake the filling?
The bake is there to cook the egg yolks. If you skip it, use pasteurized eggs and give the pie a longer chill. The texture will be softer but the flavor is the same.
Say icebox, not refrigerator, when you serve it. The ones who smile knew your mother’s kitchen.
Lemon Icebox Pie (Old-Fashioned Condensed Milk Recipe)
Old-fashioned lemon icebox pie: a graham cracker crust, a filling of sweetened condensed milk, egg yolks and fresh lemon juice that thickens on its own, a short bake to set the yolks, then hours in the cold. Sharp, sweet and sliceable. Cups and grams.
Ingredients
- 1 1/2 cups graham cracker crumbs
- 1/3 cup unsalted butter (75g), melted
- 3 tablespoons granulated sugar
- 1 can (14 ounces, 397g) sweetened condensed milk
- 3 large egg yolks
- 1/2 cup fresh lemon juice
- Finely grated zest of 1 lemon
- 1 cup heavy cream
- 2 tablespoons powdered sugar
- Thin lemon slices
Instructions
- Heat the oven to 350°F (175°C). Stir the graham cracker crumbs, melted butter and sugar together until the crumbs are evenly moistened.
- Press firmly into the bottom and up the sides of a 9-inch pie plate, using the bottom of a measuring cup. Bake for 8 minutes. Cool slightly. Lower the oven to 325°F (165°C).
- In a bowl, whisk the condensed milk and egg yolks together until smooth.
- Add the lemon juice and zest and whisk for about a minute. The mixture will thicken noticeably as you whisk. That is the reaction you want.
- Pour the filling into the crust and smooth the top. Bake at 325°F for 12 to 14 minutes, until the filling is set at the edges and barely wobbles in the center.
- Cool on a rack for 1 hour, then refrigerate for at least 4 hours, preferably overnight.
- Just before serving, whip the cream with the powdered sugar to soft peaks. Spread or pipe it over the pie and add the lemon slices. Slice with a knife dipped in hot water and wiped between cuts.
