Blackberry Jam Unverified!

My mom's jam is homespun simple and apparently off the ol' Certo box

Ingredients

  • 4 cups blackberries
  • 7 cups sugar
  • 1/2 tsp butter
  • 1 pouch pectin

Preparation

Preprep jars. Crush blackberries: half the mixture can be sieved to remove the seeds. Add berries, sugar and butter (to control foaming) and bring to a rolling boil over high heat, stirring constantly. Stir in pectin and return to boil for 1 minute before removing from heat.

Skim foam from the surface with a metal spoon and ladle immediately into prepared jars. Water-process jars for 10 minutes.