From: Arizona Cookbook
Cut sour oranges and grapefruit in half and remove the seeds. Cut the pulp and rind in slices. Measure. Add 3 times as much water as fruit. Let the mixture stand.
Boil the mixture for 20 minutes at a hard boil. Set aside for the next day.
Measure the mixture and measure an equal amount of sugar. Boil the fruit for 20 minutes, and add sugar all at once. Stir. Boil 35 min. or until a little jells on a cold saucer. Seal with paraffin while hot.