OK - I was so excited to find this, just in time to concentrate the last of the oranges for the season!!
- Pour fruit juice into a narrow-necked, food-grade plastic container such as a gallon jug. Leave room for expansion during freezing (the jug should not be more than three-fourths full). Cap and freeze.
- Remove the cap once the juice is completely frozen and suspend the jug upside down over another container such as a wide-mouth jar.
- Allow the frozen juice to thaw out drip by drip into the lower container until just ice is left in the jug. The tastier, more colorful part of the frozen substance will melt before the plain water crystals.
- Discard the remaining less colorful ice in the jug once the juice has separated during the thawing.
- Pour the separated juice back into the now empty plastic jug and repeat the freezing and dripping procedure two more times to produce a fine concentrate.
- Store the concentrate in a jar or in ice trays in the freezer.