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1
Mix figs, sugar, lemon slices, and strawberry gelatin in a large pot. Let stand for 1 hour. Bring to a boil and cook over medium heat, stirring often to prevent burning, until foam has disappeared and the preserves are thickened, 25 to 40 minutes.
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2
Sterilize jars and lids in boiling water for at least 5 minutes. Pack the fig preserves into the hot, sterilized jars, filling the jars to within 1/4 inch of the top. Run a knife or a thin spatula around the insides of the jars after they have been filled to remove any air bubbles. Wipe the rims of the jars with a moist paper towel to remove any food residue. Top with lids, and screw on rings.
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3
Place a rack in the bottom of a large stockpot and fill halfway with water. Bring to a boil and lower jars into the boiling water using a holder. Leave a 2-inch space between the jars. Pour in more boiling water if necessary to bring the water level to at least 1 inch above the tops of the jars. Bring the water to a rolling boil, cover the pot, and process for 10 minutes.
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4
Remove the jars from the stockpot and place onto a cloth-covered or wood surface, several inches apart, until cool. Once cool, press the top of each lid with a finger, ensuring that the seal is tight (lid does not move up or down at all). Store in a cool, dark area, and wait at least 2 days before opening.
