3 cups grapefruit juice (fresh or canned)
4 cups granulated sugar
1 (1.75 ounce) box pectin
3 drops red food color
Add pectin to juice and bring to a boil.
Add sugar and bring to a rolling boil for 1 minute.
Add food color. Skim and pour into six 6-ounce jars.
Skim again and seal.
Fruit Canning Recipes