Make fruit juice.
Wash fruit, dice fruit and crush soft
fruit and simmer with water to extract juice. Strain slowly. You can also use
pre-made 100% fruit juice (check to ensure the juice does not have any added sugar).
Make jelly.
Combine juice and low/no-sugar
powdered pectin (plus lemon juice for low acid fruits). Bring to a boil. Add
sugar (if using) and dissolve. Boil as hard as possible for 1 minute. Remove
from heat and discard foam (if any). Fill hot jars with hot jelly then process
for 10 minutes in a boiling water canner.
NOTE: liquid pectin is added after the jelly mixture has been boiled.