• Adjust an oven rack so that it's in the center of your oven. Then preheat the oven to 350°F.

For the crust

• Add the graham crackers to a food processor fitted with the blade attachment and blend until they are finely ground.
• Add the melted butter, sugar and cardamom -- blend just to combine.
• Pour the graham cracker mixture into a 10-inch pie plate. Use your fingers to gently press it down evenly on the bottom and edges, to form the crust. Set aside.

For the filling

• In a large mixing bowl, whisk the egg yolks with the condensed milk -- mix only until it's a smooth consistency.
• Add about 2 teaspoons of the orange zest, orange juice, lime zest and lime juice.  Mix just to blend.
• Place the pie plate with the prepared crust on a baking sheet. Then pour the filling into the crust.
• Bake in the preheated 350°F oven until the pie filling is set, 35 to 40 minutes. (If the edges of the crust are becoming too brown before the pie is set, place a large piece of foil over it for the remaining baking time -- don't wrap it, simply lay it on top gently.)
• While the pie is baking, cut the remaining 2 limes into thin slices, and then cut those in half. Set aside.
• When the pie is done, let it cool to room temperature and then garnish with the remaining orange zest and the lime slices.