Filling: Stir together sweetened condensed milk, egg yolks, orange
juice and orange liqueur.
Pour into the prepared pie shell and bake
for 15 to 20 minutes, until just set.
Remove from the oven and increase
oven temperature to 450 degrees F.
Meringue: Combine egg whites and sugar in a metal bowl. Set in a
pan of simmering water (or place the pan directly over lowest heat
if desired) and stir for a minute or two until the sugar has dissolved
and the mixture is warm.
Remove from heat.
Add cream of tartar and
salt, and beat until the meringue stands in soft peaks.
the pie and return to the oven for about 5 minutes, until golden.