Step 1

In a large bowl, combine the flour with the salt. Using a pastry blender or 2 knives, cut in the butter and lard until the mixture resembles coarse meal. Add the ice water as you toss the mixture with a fork. Gather the dough into a ball and knead 2 or 3 times until evenly moistened. Pat the dough into a 6-inch disk; wrap in plastic and refrigerate until chilled, at least 1 hour.

Step 2

Preheat the oven to 425°. On a lightly floured work surface, roll the chilled pastry into a 12-inch round 1/8 inch thick. Fit the pastry into a 9-inch glass pie plate and trim the overhang to 1/2 inch; fold the overhang under and crimp decoratively. Line the pie shell with foil and fill with pie weights.

Step 3

Set the pie shell on a baking sheet and bake for 10 minutes, or until the edge has set. Carefully remove the foil and weights and bake the shell for 15 minutes longer, or until the bottom is firm and light golden; tap the bottom with a spoon if it bubbles up. If the crust begins to brown too quickly, loosely cover the edge with foil. Transfer to a wire rack and let cool.

Step 4

Meanwhile, in a medium saucepan, combine 1 cup of the sugar with the cornstarch, 1/4 teaspoon of the salt, the egg yolks and lemon juice. Whisk in the cold water and cook over moderate heat, whisking constantly, until the mixture comes to a boil. Boil, stirring, for 1 minute. Remove from the heat and add the lemon zest and butter, stirring until the butter is melted. Pour the filling into the pie shell, cover with wax paper and let cool to room temperature.

Step 5

Preheat the oven to 350° and position a rack in the upper third. In a large stainless steel bowl, beat the egg whites with the remaining 1/4 teaspoon of salt until soft peaks form. Gradually add the remaining 1/2 cup of sugar and beat until stiff and glossy peaks form.

Step 6

Remove the wax paper from the filling. Scrape the meringue onto the pie and gently spread it over the filling all the way to the crimped edge of the pie crust. Make decorative swirls with the back of a spoon.

Step 7

Bake the pie for about 7 minutes, or until the meringue is golden brown. Transfer to a wire rack and let cool to room temperature, then refrigerate until chilled and set, at least 3 hours. Cut the pie with a sharp knife dipped into hot water and serve.