In a small saucepan, combine sugar, syrup, water, and salt. Cover tightly and
bring to a rolling boil. Remove lid and add thermometer. Cook to 270 degrees F;
remove from heat and stir in vanilla extract.
Pour cooked syrup over the popped
corn, stirring to coat corn.
Cool completely, then run through a food chopper.
Melt chocolate coating in top of double boiler.
Stir ground popcorn into chocolate,
using as much popcorn as the chocolate will hold. Pack into chocolate lined molds
or roll out between sheets of wax paper and cut into shapes with cookie cutters