20-Minute Lighter Lemon-Blueberry Jam
A reduced-sugar blueberry jam brightened with fresh lemon zest and juice plus warming ginger. Uses low-sugar pectin to achieve proper set while cutting traditional sugar content by nearly half. Perfect for spreading on toast, swirling into yogurt, or gifting to friends. The fresh ginger adds an unexpected warmth that complements the tart-sweet berry flavor without overpowering. Sets at room temperature in 24 hours without water bath processing, making it ideal for small-batch home preserving.
Ingredients
- 4 cups blueberries
- 1 package powdered low-sugar fruit pectin, 1 3/4 oz
- 1 ¾ cups sugar
- 1 lemon lemon, juiced and zested
- 1 tablespoon fresh ginger, grated and peeled
Instructions
- 1
Prepare four half-pint jars with lids and bands according to manufacturer's directions
- 2
Coarsely mash blueberries with vegetable masher in large saucepan
- 3
Stir in pectin and 1/4 cup sugar and bring to boil
- 4
Stir in remaining sugar, lemon zest, lemon juice and ginger until blended
- 5
Return mixture to rolling boil and cook, stirring constantly, for 1 minute
- 6
Remove from heat and skim off any foam
- 7
Cool to room temperature
- 8
Spoon jam into prepared jars to within 1/2-inch from tops
- 9
Wipe jars and rims clean and cover tightly with lids
- 10
Let stand at room temperature until set, about 24 hours
Tips
Use a potato masher to control texture - leave some small chunks for rustic appeal rather than completely smooth puree
Skim foam thoroughly for clearest final product and best shelf appearance
Test set by placing small plate in freezer, then dropping small amount of jam on cold plate - it should wrinkle when pushed with finger
Good to Know
Refrigerate up to 3 weeks or freeze in plastic containers up to 1 year
Best made 1-2 days before serving to allow flavors to meld
Serve at room temperature or slightly chilled
Common Mistakes
Don't skip the rolling boil step to ensure proper pectin activation
Measure headspace carefully to prevent seal failure during storage
Substitutions
FAQ
Can I use frozen blueberries instead of fresh?
Yes, thaw completely and drain excess liquid before mashing. Frozen berries may produce slightly more liquid, so cooking time might need slight adjustment.
What if my jam doesn't set after 24 hours?
Refrigerate for additional firming. Low-sugar jams have softer set than traditional recipes but will thicken when chilled.
How long does this jam keep once opened?
Once opened, refrigerate and use within 2-3 weeks. Always use clean utensils to prevent contamination and extend shelf life.