Grape Jelly from Juice

3 cups grape juice (prepared from frozen concentrate is fine)
1 package powdered pectin
4 cups sugar

In a large pot (16 to 20 quart) combine the prepared grape juice and the powdered pectin. Stir it up to eliminate all of the lumps. Bring the mixture to a full boil over medium heat, stirring some as necessary. Add the sugar and return the mixture to a boil. Boil for a full minute and remove from heat. Ladle the jelly into clean sterilized jars and seal with bands and lids. Process in a boiling water bath for about 5 minutes to seal. Remove the jars and allow to cool before storing on the pantry shelf. Makes about 5 cups.