Caramelized Onion and Shallot Dip

Ingredients

• 2 pounds large yellow or white onions
• thinly sliced
• 2 large shallots
• thinly sliced (about 6 ounces total)
• 4 sprigs thyme
• 1/4 cup olive oil
• Kosher salt and freshly ground black pepper
• 1 freshly ground black pepper
• 1 cup dry white wine
• 2 tablespoons Sherry vinegar
• 2 cups sour cream
• 1/4 cup minced fresh chives
• 1/4 cup plain whole-milk Greek yogurt
• 2 teaspoons onion powder

Instructions

1. 1

   Preheat oven to 425°F.

2. 2

   Mix onions, shallots, thyme sprigs, and oil in a large roasting pan.

3. 3

   Season with salt and pepper.

4. 4

   Roast onion mixture, stirring and scraping down sides of pan every 10 minutes, until mixture starts to break down and turn golden brown, 45-55 minutes.

5. 5

   Discard thyme sprigs.

6. 6

   Add wine and vinegar; stir to scrape up any browned bits from bottom of pan.

7. 7

   Return onion mixture to oven.

8. 8

   Continue roasting, stirring occasionally, until deep golden brown and completely caramelized, about 15 minutes longer.

9. 9

   Spread onion mixture out on a rimmed baking sheet to cool.

10. 10

    Transfer onion mixture to a work surface and mince.

11. 11

    Transfer to a medium bowl.

12. 12

    Stir in sour cream, chives, yogurt, and onion powder.

13. 13

    Season with salt and pepper.

14. 14

    DO AHEAD: Dip can be made 3 days ahead.

15. 15

    Cover; chill.