Instructions

  1. In a large pan, combine berries with sugar.
  2. Crush berries with a potato masher.
  3. Add lemon juice and lemon rind.
  4. Bring to a boil, skimming off any foam that forms.
  5. Cook at a full boil until jam thickens, approximately 30 minutes (jelling point is 221F).
  6. While the berries are cooking, sterilize your jars and heat the seals in a pan of hot water.
  7. Pour jam into hot jars; wipe rims, place seals and screw on bands fingertip-tight.
  8. Process in a boiling water bath for five minutes; remove to a protected countertop and let cool, undisturbed for 24 hours.
  9. If any of the lids have not sealed, either re-process or store in the refrigerator and use those jars first.