Sour Cherry Jam (low sugar)

 

Ingredients

• 5 pounds sour cherries pitted
• 1 pound 3 ounces granulated sugar
• 1 tablespoon + 1 teaspoon calcium water
• 1 tablespoon + 1 teaspoon Pomona's Pectin

Instructions

• Prepare a boiling water bath canner and enough jars to hold 4 pints.
• In a low, wide, non-reactive pot, combine the pitted cherries, 1 pound of sugar, and all the calcium water.
• Set pot over high heat and bring to a rolling boil. Reduce heat to medium-high and cook at a vigorous boil for 20 to 25 minutes, until the volume has reduced by at least one-third.
• Stir pectin into the remaining sugar and stream it into the cooking jam, using a whisk to stir to help prevent clumps.
• Return the contents of the pot to an active boil and cook for an additional 2 minutes and then start looking for signs of thickening (it should be pretty clear as Pomona's pectin sets quickly). Once you see some thickening, remove the pot from the heat.
• Funnel the jam into the prepared jars, leaving 1/2 inch headspace. Wipe the rims, apply lids and rings, and process in a boiling water bath canner for 10 minutes.
• When the time is up, remove the jars and set them on a folded kitchen towel to cool. When the jars have cooled enough that you can comfortably handle them, check the seals. Sealed jars can be stored at room temperature for up to a year. Any unsealed jars should be refrigerated and used promptly.

NOTES:

• From the Food in Jars site: Now, for the pectin. I like to use less pectin that the Pomona’s packet instructions call for. Typically, I use between 1/2 and 3/4 teaspoon calcium water and pectin for every pound of fruit. Use less for a soft set and a bit more for a firmer set.
• The cherries were easy to pit and that worked better than the food mill.
• I made a half batch from cherries on our backyard tree.