Onion Mustard Sauce

• FAST
• MAKE-AHEAD
• VEGETARIAN

Ingredients

1. 1 small onion, minced
2. 1/2 cup dry white wine
3. 1/2 cup heavy cream
4. 2 tablespoons cold unsalted butter, cut into 4 pieces
5. 1/4 cup whole-grain mustard
6. Salt and freshly ground pepper

1. In a small saucepan, combine the onion and white wine and simmer over moderate heat until the wine is reduced to 1 tablespoon, about 5 minutes. Add the heavy cream and bring to a boil. Transfer the mixture to a blender and puree. With the machine on low speed, add the butter, 1 piece at a time, until the sauce is smooth.
2. Scrape the onion sauce into a small saucepan and stir in the mustard. Season with salt and pepper. Rewarm the sauce over low heat, stirring constantly. Serve the sauce warm.