Combine pears and apple juice in a large pot. Tie broken cinnamon sticks and next 3 ingredients in a piece of cheesecloth; add to pear mixture. Bring to a boil; cover, reduce heat, and simmer 45 minutes to 1 hour until pears are tender. Drain pears, and discard spice bag. Mash pears or process in food processor until smooth. Return pear puree to pot and add sugar. Cook, uncovered, over medium heat 30 to 40 minutes or until mixture thickens, stirring frequently. Remove from heat, and quickly pour hot pear mixture into hot sterilized jars, leaving 1/4 inch headspace; wipe jar rims. Cover at once with metal lids, and screw on bands. Process in boiling water bath 5 minutes.