To 3 1/2 pounds of clean grapes add 1 cup water
Add the fruit pectin to the juice
On high heat, bring to a full rolling boil, and boil hard for 1 minute, stirring constantly.
Stir in sugar all at once, and bring back to a full rolling boil, again boil hard for 1 minute stirring constantly. (I add a tsp of butter at this time to help keep the foam down)