Red Wine Caramelized Onions

Directions

1. 1
   1) Thinly slice a red onion (slice it with - as opposed to against - the grain of the onion).
2. 2
   2) In a large saute pan, add the butter and the olive oil and melt over medium heat.
3. 3
   3) Add the red onions and sprinkle with kosher salt.
4. 4
   4) Cook the onions until soft and the pan starts to dry out - about 5 minutes.
5. 5
   5) Add the wine to the pan, and scrape the browned bits up. Continue to cook on low heat another 15 minutes. Whenever the pan gets dry, add 1/4 cup of water.
6. 6
   6) After the onions have been cooking about 20 minutes total, add the vinegar and sugar and cook another 5 minutes. The pan should be dry.
7. 7
   7) Scrape all of the onions into a bowl and refrigerate until ready to use.