I found this one but its for RED pepper Jelly, can you just switch it out?

Red Onion Jelly Recipe

This is a very good on cream cheese with crackers. It is great on Roasted Chicken and other meats.
(6 pints)

3 cups red onions
1 1/2 cups apple juice
1/2 cup red wine vinegar
1 1/2 teaspoons rubbed sage
1/2 teaspoon pepper
4 cups sugar
3/4 cup firmly packed light brown sugar
1 (1 3/4 ounce) package powdered fruit pectin
1/2 teaspoon butter
Peel, quarter and thinly slice red onions.
Measure 3 cups into a 6-or-8-quart sauce pot.
Stir in apple juice, vinegar, sage and pepper.
Measure sugars in a separate bowl.
Stir fruit pectin into onion mixture in sauce pot.
Add butter.
Over high heat, bring mixture to a full rolling boil, stirring constantly.
Quickly stir in sugars.
Return to a full rolling boil and boil exactly 5 minutes, stirring constantly.
Remove from heat.
Skim off any foam with metal spoon.
Ladle quickly into hot, sterilized half pint jars, filling to within 1/8 inch of tops.
Wipe jar rims and threads.
Cover with lids.
Screw bands tightly.
Process in a boiling water bath for 5 Minutes.

© 2009 Recipezaar.

Could this be what your looking for?
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Sweet Onion Jelly

Serve with cream cheese for crackers or bagels or use as a condiment on beef, pork or chicken. Also great on hotdogs, sausages and sandwiches.

yeilds - 3 1/2 cups

3 cups chopped onions (Vidalia, Walla Walla or your favorite sweet variety)
3/4 cup cider vinegar
2 1/2-3 cups sugar
1 teaspoon crushed red pepper flakes
1 package powdered fruit pectin (Ball Fruit Jell No Sugar Needed variety)

1. Puree the onion and vinegar together in a blender until smooth.
2. Pour into a saucepan.
3. Add the sugar and crushed pepper and bring to boil over medium-high heat.
4. Boil for five (5) minutes and then stir in the powdered pectin.
5. Bring to a hard boil and boil for one (1) minute.
6. Pour into hot sterilized jars, secure the lids and process for ten (10) minutes in a boiling water bath.

© 2009 Recipezaar.

You might ask at the Harvest forum.

Here is a link that might be useful: Harvest forum

Thanks for the help. I think I will try the sweet onion jelly without using the red pepper flakes.