Easy Blueberry Jam Recipe for Canning

Fill your pantry with jars of this delicious blueberry jam with ginger. Spread it on toast for a taste of summertime all year round!

4.48 from 51 votes

Print Pin

Prep Time: 15

Cook Time: 20

Processing Time: 10

Total Time: 45

Servings: quarter-pint jars

Author: Kris Bordessa

Prepare the calcium water:
Combine ½ teaspoon calcium powder (from the small packet in the box of Pomona’s pectin) with ½ cup water in a small jar. Screw on a lit and shake until well-combined. You'll have more than you need for this recipe. Store the excess in the refrigerator for use in making additional jam or jelly recipes.
Wash the jars you'll use, making sure each is clean and free of nicks in the rim, which could impede sealing.
Wash the lids and rings in hot soapy water. (If you're using non-Ball brand lids, prepare as suggested by manufacturer.)
Place empty jars in a canning pot or large stock pot with enough water to cover by an inch or two, cover pot, and set on high heat. It can take awhile for the water to heat, so get it started before you begin making the recipe.

Measure the crushed berries, lemon juice, and calcium water into a large saucepan; bring to a boil.
4 cups crushed blueberries, 1/4 cup lemon juice, 2 teaspoons calcium water
Meanwhile, combine the sweetener with the pectin until it's thoroughly combined.
1/2 cup honey, 2 teaspoons pectin
When the berry mixture comes to a boil, stir in the pectin and sweetener, stirring vigorously for 1 to 2 minutes to dissolve the pectin while bringing the jam back to a boil. Remove from heat when the jam boils and stir in the ginger.
1 tablespoon ginger

Ladle hot jam into quarter-pint, half-pint, or pint sized jars, leaving 1/4" head space. A canning funnel makes this easy.
Wipe jar rims to remove any jam that may have spilled. A clean rim is essential to a good seal.
Place lids centered on the jar rim. Screw bands on finger tight.
Use a jar grabber to gently submerge jars into hot water in the canning pot. Water should cover the top of the jars by an inch. The water will cool somewhat in reaction to the addition of the jars. Return the water to a simmer and then set the timer.
Process for 10 minutes 0-1,000 feet altitude; add an additional minute for every additional 1,000 feet in elevation.
Remove jars from water using the jar lifter and transfer to a solid, towel-covered surface. Listen for the popping sound of the lids sealing (a canner's favorite sound!). Allow to cool for 24 hours.
Check seals. Lids should be solid and pulled down tight. (if they flex and pop, the jar didn’t seal; put unsealed jars in the refrigerator and use those first).
Remove rings and wash outsides of jars. Store in a cool dark place.

Recipe yields 10 quarter-pint jars.
This recipe is made using Pomona’s Universal Pectin. This is the only pectin I use anymore as it allows me to use much less sweetener. The standard pectin brands use an obscene amount of sugar in my opinion, often requiring equal amounts of sugar and fruit! This product uses a low methoxyl method and calls for using two different ingredients, which are included in the box: pectin (the large packet) and calcium powder (the small packet).
If you'd prefer to use sugar, use 3/4 cup to replace the 1/2 cup of honey.
This recipe can be made using half-pint jars if you prefer.
The pH for this recipe (as made above) tests at 3.5.
Boiling lids or heating above 180°F as once recommended can damage the sealing compound.
SOURCE: Adapted from Pomona's Universal Pectin.