For the crust, combine ingredients and pat down into a 9-inch pie pan. Bake for 5 to 10 minutes.
Filling
In a medium bowl, combine the milk, lime juice, and 1 tsp. lime zest; blend in the egg yolks. Pour the filling into the crust.
Bake for 12 to 15 minutes, or until the meringue is golden brown.
Meringue
Beat the egg whites with the cream of tartar until soft peaks form. Gradually beat in the sugar and remaining teaspoon zest until the mixture is stiff. Spread the meringue over the filling; spread it to touch the edge of the crust all around.