Blackberry Jam

5 cups crushed berries (2-3 quarts uncrushed)
7 cups sugar
1/4 cup lemon juic
1 package (1.75 oz) fruit jell pectin/Dutch Jell/Sure Jell

Crush berries with potato masher. Put berries into a large pot. Add pectin a little at a time, stirring constantly. Place on high heat, stirring constantly until mixture comes to a full boil. Add sugar all at once while stirring. Bring mixture back to a full hard boil, stirring constantly. Boil 1 minute. Remove from heat and ladle into clean, hot 8 oz jars, leaving 1/4 head space at the top. Wipe rims of jars and put canning lids and rings on firmly. Process in boiling water bath for 5 minutes. Remove and set upright on a towel to set for 12 hours.