01 -
Heat the oven to 350°F (175°C). Crush the saltines into coarse crumbs with a food processor or a rolling pin, keeping a little texture instead of making a fine powder.
02 -
Stir the crumbs with melted butter, sugar, egg white, and fine salt until evenly moistened. Press firmly into the bottom and sides of a 9-inch pie plate, then refrigerate for 15 minutes.
03 -
Bake the chilled crust for 16-18 minutes, until lightly golden and fragrant. Set it on a rack while you make the filling.
04 -
Whisk the sweetened condensed milk and egg yolks until smooth. Add lemon juice, lime juice, zest, and salt, then whisk until the filling looks glossy and slightly thickened.
05 -
Pour the filling into the warm crust. Bake for 14-16 minutes, until the edges are set and the center has a gentle wobble. If using a thermometer, the filling should reach 160°F.
06 -
Cool the pie to room temperature on a rack. Refrigerate for at least 3 hours, or overnight, until fully cold and sliceable.
07 -
Beat the heavy cream, powdered sugar, and vanilla to soft peaks. Spread over the chilled pie, then finish with citrus zest and a few flakes of sea salt before slicing.