1 1/2 T. grated orange rind
1 1/2 C. sugar
1/4 C. fresh-squeezed lemon juice
1 1/2 C. fresh-squeezed orange juice
1 t. vanilla
4 C. very cold (low-fat) milk
Stir together grated orange rind and sugar. Stir in lemon juice, orange juice and vanilla and continue stirring until sugar is dissolved. Add milk.
Put mixture in ice cream freezer and freeze according to manufacturer's directions.