BLUEBERRY JAM

Steps:

• Place a wire rack on a rimmed baking sheet. Place several small plates in the freezer to use later to test the consistency of the jam.
• In a large, heavy-bottomed saucepan, combine the blueberries, sugar, lemon juice, and salt. Let stand until the berries start rendering their juice, about 15 minutes.
• Meanwhile, sterilize eight 1/2-pint canning jars and lids in boiling water, following the manufacturer's instructions (or see Boiling-Water Canning, page 279). Remove the jars from the water and place upside down to drain on the prepared rack. Remove the lids from the water and dry with a clean towel. Turn the sterilized jars right side up on the rack, using tongs or a kitchen towel to protect your hands. When they are cool enough to handle, dry them with a clean towel. Set aside.
• Follow the procedure for Raspberry Jam (page 289), including bringing the blueberry mixture to a boil and cooking until the mixture reaches the jelling point, preparing the canner, filling the jars and boiling them gently for 5 minutes, and checking that the seals on the jars are good. When the jam reaches the jelling point (220°F), add the candied ginger and stir to combine. Store the unopened jars of jam at room temperature for up to 1 year. Once the jam is opened, store in the refrigerator for up to 1 month.
• variation
• For refrigerator or freezer jam, transfer the mixture to sterilized freezer-safe plastic containers or freezer-safe jars with lids, leaving 1 inch of headroom. Freeze for up to 1 year or refrigerate for up to 1 month.