Caramelized Onion Tarts With Apples

By mitzzy

The tarts can be assembled and frozen up to 1 month in advance. Freeze them, unbaked, on parchment-lined baking sheets until firm, then wrap in plastic. To cook, bake from frozen at 400º F for 40 to 50 minutes; keep warm at 250º F. Cut just before serving.

Ingredients

• 2 tablespoons olive oil
• 2 medium onions, sliced
• 2 red apples (such as Braeburn or Gala), cut into small pieces
• kosher salt and black pepper
• 2 sheets frozen puff pastry (from a 17.3-ounce package), thawed
• 1/2 cup creme fraiche or sour cream

Preparation

Step 1

1.Heat oven to 400º F. Heat the oil in a large skillet over medium heat. Add the onions and cook, stirring occasionally, until soft and golden brown, 12 to 15 minutes. Stir in the apples, ½ teaspoon salt, and ¼ teaspoon pepper and cook until just tender, 2 minutes.
2.Place each sheet of pastry on a parchment-lined baking sheet and prick all over with a fork. Spread with the crème fraîche, leaving a ½-inch border. Top with the onion mixture and bake until the pastry is crisp and browned, 30 to 35 minutes. Cut into pieces before serving.