Mix juice, pectin, butter, and water in a large pot. Stir constantly over high heat bringing it to a full boil. Add sugar all at once stirring to dissolve.

Bring to a full boil again and let boil for 1 minute, stirring constantly. Pour into jars, seal, turn upside down for 5 minutes. Turn right-side up and let cool. This recipe yields 5 standard size jelly glasses.