Combine pomegranate juice and lemon juice with sugar in a large pan. Bring to a boil over high heat and at once stir in liquid pectin. Bring to a full rolling boil, and boil exactly 1/2 minute. Remove from heat, skim off foam.
Ladle into hot jars within 1/4 inch of the top. Seal and process in a boiling water bath for 5 minutes.