Combine graham cracker crumbs with sugar, then pour melted butter over the top and stir until the texture feels like wet sand. Press this firmly into a 9-inch pie pan, creating an even layer across the bottom and partway up the sides—this foundation holds the filling without cracking later.

Pour sweetened condensed milk into a medium bowl, then add fresh lime juice slowly while stirring. The mixture will thicken slightly as the acid hits the milk, which is the exact moment you know the chemistry is working correctly.

Stir in lime zest and salt, making sure the zest distributes throughout so flavor hits every section. I always use a microplane for zest because it releases the oils more effectively than a box grater does.

In a separate bowl, whip heavy cream with powdered sugar and vanilla extract until stiff peaks form—this takes about three minutes with an electric mixer. This step cannot be rushed because underwhipped cream won't hold the structure the pie needs.

Fold the whipped cream gently into the lime mixture using a rubber spatula, making maybe ten full turns until no white streaks remain. Overfolding deflates those peaks you just worked to create, so stop as soon as the color looks even.

Pour the filling into your prepared crust and smooth the top with the back of a spoon. Cover with plastic wrap, then refrigerate for at least four hours—overnight is better because it lets flavors settle.

Remove from the refrigerator fifteen minutes before slicing so the cold doesn't numb the lime flavor on your tongue. Serve with extra lime zest sprinkled on top if you want that visual wow.