open jar of strawberry jam next to fresh strawberries

Strawberry Jam Sweetened with Juice Concentrate

Strawberry Jam Sweetened with Juice Concentrate is a cooked jam made with Pomona’s Universal Pectin. Pomona’s Pectin contains no sugar or preservatives and jells reliably with low amounts of any sweetener.
Servings 4 cups


  • 3 cups mashed strawberries
  • 2 teaspoons calcium water see step #1
  • 1 cup juice concentrate white grape or apple, no sugar added – can be found in the freezer section of a grocery store
  • 2 teaspoons Pomona’s Pectin


  • Before you begin, prepare calcium water.
    To do this, combine ½ teaspoon calcium powder (in the small packet in your box of Pomona’s pectin) with ½ cup water in a small, clear jar with a lid. Shake well.
    Extra calcium water should be stored in the refrigerator for future use.
  • Wash jars, lids, and bands. Place jars in canner, fill canner 2/3 full with water, bring to a boil. Turn off heat, cover, and keep jars in hot canner water until ready to use. Place lids in water in a small sauce pan; cover and heat to a low boil. Turn off heat and keep lids in hot water until ready to use.
  • Wash, hull, and mash strawberries. Measure mashed strawberries into sauce pan.
  • Add calcium water and mix well.
  • Bring juice concentrate to a boil in a separate sauce pan. Put boiling concentrate in cup for immersion blender, or in food processor, or in blender. Add pectin. It is very important to vent the lid (if there is one) to let steam out. Don’t use an enclosed blender that can’t be vented. Blend for 10 seconds, then stop and scrape down the sides so all pectin clumps are in or on the liquid. Then blend for a full minute until all powder is totally dissolved.
  • Bring fruit mixture to a full boil. Add pectin-concentrate. Stir for 1 minute while mixture returns to a full boil. Remove from the heat.
  • Fill hot jars to ¼” of top. Wipe rims clean. Screw on 2-piece lids. Put filled jars in boiling water to cover. Boil 10 minutes (add 1 minute more for every 1,000 ft. above sea level). Remove from water. Let jars cool. Check seals; lids should be sucked down. Eat within 1 year. Lasts 3 weeks once opened.

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6 Responses

  1. Mary Pasley
    | Reply

    Can liquid white grape juice made from concentrate (no extra ingredients) be used? I cannot find frozen from concentrate in my stores.

    • Shelby Collings
      | Reply

      Yes, that should be just fine!

  2. Cheryl Kirchner
    | Reply

    I usually use frozen White Grape juice but none is available this year in my area, won’t using apple juice give the jam and apple flavor?

    • Shelby Collings
      | Reply

      Hello Cheryl,
      What a bummer! We have found that with apple juice, not much flavor is apparent when using berries for your jam. Peaches do tend to have the apple flavor be more present.

  3. Johnna Duke
    | Reply

    Can regular grape juice from concentrate be used for this recipe? The frozen purple kind?

    • Shelby Collings
      | Reply

      Only if it is 100% natural with no additional sugar added.

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