Drain the zucchini slices in a colander in the sink; thoroughly wash the glass jar. Rinse the zucchini slices very well under running water to rinse away all the lime and place the slices back into the jar. Cover with fresh cool water, allow to stand for 2 to 3 hours and drain away the water. Rinse again.
Place the zucchini slices into a large pot, and stir in 1 cup vinegar, the alum, food coloring, and 2 more cups water (or enough water to cover the zucchini slices). Bring to a boil over medium heat, reduce heat to low, and simmer the zucchini slices for 2 hours. Drain the zucchini slices and discard the liquid.
Place the zucchini slices back into the glass jar. Mix together 1 cup of vinegar, 3 more cups of water, the sugar, cinnamon sticks, and red hot candies in a saucepan over medium heat. Bring to a boil, and stir until the sugar and candies dissolve. Pour the syrup over the zucchini slices. Allow the zucchini to stand covered for 24 hours. Drain and reserve the syrup. Bring the syrup to a full rolling boil in a saucepan over medium heat.
Sterilize the canning jars and lids in boiling water for at least 5 minutes. Pack the zucchini slices into the hot, sterilized jars, and pour the hot syrup into 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.
Place a rack in the bottom of a large stockpot and fill halfway with water. Bring to a boil over high heat, then carefully lower the jars into the pot using a holder. Leave a 2 inch space between the jars. Pour in more boiling water if necessary until the water level is at least 1 inch above the tops of the jars. Bring the water to a full boil, cover the pot, and process for 20 minutes.
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.
Makes 8 half-pint jars
By LRP from LWL, MA
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