French Onion Galette
Ingredients
- 2 tablespoons canola oil
- 3 pounds yellow onions, cut into 1/2-in. wedges
- 4 thyme sprigs
- 1 teaspoon kosher salt
- 1 teaspoon sherry vinegar
- ½ teaspoon black pepper
- ½ (16-oz.) pkg. refrigerated whole-wheat piecrusts
- 1 ½ ounces Gruyère cheese, shredded (about 1/3 cup)
- 1 large egg, lightly beaten
- 1 teaspoon water
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