FOR THE CRUST:
1 1/2 cups graham cracker crumbs
1/2 cup (4 ounces) unsalted butter, melted
2 tablespoons granulated sugar
Freshly grated zest of 1/2 lime

FOR THE FILLING:
1 (14 ounce) can sweetened condensed milk
1/2 cup key lime juice*
4 large egg yolks
Freshly grated zest of 1/2 lime

FOR THE LIME CURD TOPPING:
1 cup granulated sugar
2/3 cup lime juice*
8 large egg yolks
1/4 to 1/2 teaspoon lime oil (optional; see Note**)

FOR THE WHIPPED CREAM:
1 1/2 cups heavy (whipping) cream
5 tablespoons granulated sugar