Bring juice, vinegar and peppers to a boil in a large pot. Simmer for 10 minutes. Remove and discard pepper pulp. If you desire a very clear jelly you can strain, or pour through a cheesecloth.
Measure 2 cups of liquid and return to pot.
Bring to a hard boil, and add sugar all at once. Stir to dissolve, and then add the liquid pectin.
Boil hard for 1 minute.
Pour into jelly jars, leaving 1/4 inch of headspace.
Add 1 small whole red chili pepper (optional)
Wipe rims and seal with lid and ring.
Process in water bath for 5 minutes.