SOUR CHERRY PRESERVES

Steps:

• Toss together cherries, sugar, and lemon juice in a large bowl.
• Wrap cherry pits in a paper towel and crack them with a rolling pin or pestle just enough to extract inner white kernels. Discard outer shells and tie white kernels in a cheesecloth bag. Stir bag into cherry mixture and chill, covered, at least 8 hours and up to 1 day.
• Sterilize jars and lids .
• Pour cherries with liquid and cheesecloth bag into a 5- to 6-quart heavy pot (sugar will not be completely dissolved). Bring to a rolling boil over moderate heat, then boil, uncovered, stirring frequently, 5 minutes. Remove from heat and transfer cherries with a slotted spoon to a sieve set over a bowl to catch juice. Drain cherries 5 minutes, then add juice from bowl to juice in pot.
• Drain jars upside down on a clean kitchen towel 1 minute, then invert. Divide cherries among jars using a slotted spoon.
• Return juice in pot to a rolling boil, skimming off any foam. Continue boiling until juice registers 220 to 224°F on thermometer, 7 to 10 minutes. Discard cheesecloth bag.
• Gradually add pectin, whisking constantly. Return juice to a rolling boil, then boil, skimming off any foam, 1 minute. Ladle juice into jars, leaving 1/4 inch of space at top, then run a thin knife between fruit and jar to eliminate air bubbles.
• Seal, process, and store filled jars , boiling preserves in jars 10 minutes.
• Let preserves stand in jars at least 1 day for flavors to develop.