Robert Sauce

Directions

1. 1
   In a saucepan, over medium heat, melt the butter.
2. 2
   Add the onions and saute for 1 minute.
3. 3
   Add the wine and bring to a boil and cook for 2 minutes.
4. 4
   Stir in the mustard.
5. 5
   Add the demi-glace and reduce the heat to medium.
6. 6
   Simmer for 20 minutes.
7. 7
   Remove from the heat and serve.
8. 8
   The sauce is great on grilled meats, especially on pork.