French onion tart
From the book, “Five Ingredient Fix.” (Chicago Tribune)
Prep: 15 minutes
Total time: 40 minutes
Servings: 6
Ingredients:
1 sheet frozen puff pastry, thawed in refrigerator
2 tablespoons extra-virgin olive oil
3 large sweet onions, thinly sliced
4 thyme sprigs, plus more for garnish
1/4 teaspoon coarse salt
Freshly cracked black pepper