Fresh tasting and delicious, this Blackberry Freezer Jam is so easy to whip up. Just three ingredients and 20 minutes (including clean up!), and you’ll have homemade blackberry jam made by your very own hands.
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Freezer jam is one of those recipes that can be a gateway project to actual canning. Since it is so easy and tastes amazing, you’ll start wanting to make jam all the time!
Today, let’s tackle some homemade low-sugar blackberry freezer jam!
If you’re feeling adventurous, try your hand at Low-Sugar Strawberry Jam which is an actual canning recipe. It’s still incredibly easy but you’ll need some canning equipment (related: Canning Supplies Equipment List).
CAN I USE LESS SUGAR IN FREEZER JAM?
Yes, but my recipe already calls for less sugar than the pectin company recommends. If you plan to reduce the sugar even more, please note the consistency of the final product will be impacted.
HOW LONG DOES FREEZER JAM LAST?
Low-sugar blueberry jam is good for three weeks in the fridge or 9-12 months in the freezer.
CAN I USE ALTERNATE SWEETENERS IN FREEZER JAM?
Yes. If you want to replace the sugar with an alternative sweetener, you can. For Splenda you would want to use a 1:1 ratio, so 1 cup of sugar would be 1 cup of Splenda.
To replace with Stevia, you would use 1 tsp of powder or liquid concentrate to 1 cup of sugar. Please note, without the “bulk” of the sugar, your freezer jam is very likely to be much runnier if using Stevia.
CAN YOU MAKE JAM USING FROZEN FRUIT?
Yes! You can absolutely use frozen blackberries to make this jam. Allow them to defrost first and include any blackberry juice that results during the thawing process. Learn how to freeze your own in this post on Freezing Blackberries.
PRO TIPS/RECIPES NOTES:
- If you are using frozen berries, allow them to sit out at room temperature for a few hours or overnight to thaw.
- If you’re using glass jars, make sure you leave 1/2 inch of headspace when filling the jars. Headspace is the space between the top of the food and the top of the jar. You need to give the jam a bit of room to expand in the freezer. Don’t just jam it in there…<—–not sorry!
- You’ll need about 6 cups of blackberries to yield 3 1/2 cups of smashed berries.
Blackberry Freezer Jam
- Use a potato masher or pastry cutter and lightly smash the blackberries.6 cups blackberries
- Measure 3 1/2 cups of blackberries into a mixing bowl.
- Add 1 cup of sugar and 1/3 cup of freezer jam pectin to the blackberries. Mix with a large spoon for three minutes.1/3 cup freezer pectin, 1 cup sugar
- Pour into your preferred containers, leaving 1/2 inch of space between the tops of the jam and the tops of the jars.
- Place lids on the jars, and allow them to sit at room temperature for 1-2 hours.
- Then label and freeze!