You start out the same way as you do for juice. Wash and destem your grapes. Cover in water and cook until tender. Then pour grapes through a jelly bag and let sit until all the juice has come through.
Measure out 5 cups of juice. Add to this one package of powdered pectin and bring to a boil stirring constantly. Then add 7 cups of sugar. Return to a boil and boil for 1 minute. Skim off the foam. This jelly made a lot of foam. So I had a lot to skim off. Then ladle jelly into clean sterilized jars. Fill leaving 1/4 inch head space. Wipe rims with a clean wash cloth. Adjust lids and process in a boiling water bath for 5 minutes. This yields about 8 8oz jars of jelly. I ran out of jelly jars so I used two pint jars. This jelly will taste great on toast and home made rolls. No PB&J's at our house. My kids are allergic to peanuts!! But they do eat butter and jelly sandwiches!!