Line ten 3-in/8-cm-long, 1-in/3-cm-diameter PVC tubes with a strip of acetate. Place on a flat sheet pan lined with a silicone baking mat and freeze.
To juice the apples, cut the apples into sixths and pass through a professional juicer. As the juice pours out of the juicer, stir the ascorbic acid into the container into which the juice is pouring, to prevent o