Gather fruit juice, sugar, pectin, lemon juice, a pot, a spoon, jars, and lids
Wash and sterilize the jars and lids
Measure the fruit juice
Combine the juice and pectin in a pot
Bring the mixture to a rolling boil over medium-high heat
Add the sugar all at once
Stir constantly until the sugar dissolves
Return to a full rolling boil
Boil for the time specified by the pectin package
Remove from heat
Skim off any foam
Pour the hot jelly into prepared jars
Leave a small amount of headspace
Wipe the jar rims clean
Seal with lids
Process the jars in a boiling water bath if needed
Let the jars cool completely
Check that the lids have sealed
Store in a cool, dark place