5 1/2 c. prepared plum juice
7 1/2 c. sugar
1 box Sure Jell fruit pectin

Use fully ripe fruit. Wash and remove stems from plums. Place in 6 or 8 quart boiler; cover with water and boil 15 to 20 minutes. Let cool. To extract juice, place prepared fruit in dampened jelly bag or several thicknesses of cheesecloth. Let drip, when dripping gently press or squeeze bag.

Measure sugar and set aside.

Measure juice and add Sure Jell. Bring to a full boil over high heat, stirring constantly. At once stir in sugar. Stir and bring to a full rolling boil that cannot be stirred down; boil hard for 5 minutes, stirring constantly. Remove from heat, skim off foam with large metal spoon. Immediately put into hot jars and seal.