Key Lime Pie

Name: Key Lime Pie
Prep time: 15 min
Cook time: 25 min
Total time: 4 h
Yield: 8
Ingredients: Ingredients; Crust; 1 1/2 cups graham cracker crumbs; 1/4 cup sugar; 1/2 cup (1 stick) unsalted butter, melted; Filling; 4 large egg yolks; 1 can (14 oz) sweetened condensed milk; 1/2 cup fresh key lime juice (or regular lime juice); 1 tablespoon lime zest; A few drops of green food coloring (optional); Topping; Whipped cream (optional, for serving); Extra lime zest for garnish (optional)