Grape Syrup

Steam juice concord grapes.  Pour juice into pan.  Add ½ - 1 cup of sugar to every cup of juice.  Bring to a boil.  Pour into jars.  Wipe off jar rim.  Boil flats then place flats and rings on jars.  Process – steam or hot water bath – Pints – 15 min., Quart – 20 min.