Popcorn Balls

This is the popcorn balls recipe. I tried this once, and only once, and failed MISERABLY! We threw the entire thing away. My guess is that i did tnot get the sugar hot enough, because i was just left with syrupy slop, you need a candy thermometer no matter what.

1c sugar
1/2 corn syrup
pinch salt

3T vinegar

cook until hard ball

1/2 t butter
1/2t vanilla