Microwave cactus jelly recipe in the canning category

: In a 2 or 3 quart glass measure or casserole, combine cactus juice and pectin. Stir until pectin is dissolved. Cook on high, uncovered, for 7 to 14 minutes or until boiling, stirring every 3 minutes. Boil for 1 minute. Add lemon juice. Gradually stir in sugar until blended. Cook on high for 5 to 7 minutes or until mixture returns to a boil. Stir every 2 minutes to prevent a boil over. Boil for 2 minutes. Skim foam from top. Pour into hot sterilized 1/2 pint jars. Cover with hot sterilized lids and screw bands. Invert jar and quickly return to upright position.