Caramelized Onion Rings

Directions

1. 1
   Separate onion slices into rings, set aside.
2. 2
   In heavy nonstick frypan, evenly sprinkle sugar and heat over medium heat until sugar melts and starts to brown.
3. 3
   When sugar is medium brown, add butter, Worcestershire sauce and vinegar.
4. 4
   When butter starts to bubble, add the onion rings.
5. 5
   Raise the heat slightly and saute, stirring frequently, until onion is translucent and covered with dark brown caramel sauce, about 6 or 8 minutes.
6. 6
   Add salt and pepper to taste.