¾ cup lime juice (about 6 Persian limes or 12 key limes)
Pinch of salt
Whipped cream: 1 cup heavy cream
¼ cup powdered sugar
3 tbsp full-fat Greek yogurt
1 tbsp dark rum (optional)
Recipe
Make the crust: preheat oven to 325°F with the rack in the middle. Crush graham crackers in a ziplock bag to coarse crumbs. Mix with melted butter, coconut oil, sugar, and salt until it resembles wet sand. Press evenly into a 9-inch pie dish up the sides. Bake, rotating once, 12–15 minutes until golden. Cool on a rack.
Make the filling: whip lime zest, salt, and egg yolks in a stand mixer 2–3 minutes until thickened. Add condensed milk and mix 3 minutes until thickened. Add lime juice and mix until combined.
Pour filling into the cooled crust. Bake exactly 15 minutes — the filling will rise slightly but not change color; it should be wiggly but not liquid.
Cool at room temperature 30 minutes, then refrigerate at least 2 hours.
Make the whipped cream: whip cream and powdered sugar to stiff peaks. Whisk in Greek yogurt and rum (if using). Top the pie just before serving with lime zest and thin lime rounds.