Caramelized Onion Tart

By ltrodrigu

Ingredients

• 4 tablespoons butter
• 1 1/2 large yellow onions, thinly sliced, plus 1/2 onion, minced
• Kosher salt
• 1 tablespoon olive oil
• 1/2 cup plus 1 tablespoon heavy cream
• 2 (6-inch) sheets frozen puff pastry
• 1 egg yolk, beaten
• 3 tablespoons minced chives

Details

Servings 4

Preparation

Step 1

Preheat oven to 400 degrees and remove puff pastry from freezer. Melt butter in a large sauté pan over medium heat. Add sliced onions and season with a pinch of salt. Cook, stirring, until onions caramelize but retain some bite, about 15 minutes.

Meanwhile, heat oil in a small pot over medium heat. Add minced onions and sauté until softened but not browned, about 3 minutes. Add all but 1 tablespoon cream and bring to a boil. Reduce heat and simmer gently until onions are tender and cream tastes of onion, 5 minutes. Use a blender or food processor to purée until smooth. Season with salt to taste.

Line two baking sheets with parchment and place 1 sheet of puff pastry on each. Mix yolk with remaining cream and brush mixture over pastry. Place in oven and bake until puffy and lightly golden, about 10 minutes.

Spoon ¾ of onion purée evenly over both sheets of pastry, leaving a ½ inch border all around. Spread caramelized onions over purée. Bake until topping gently sets and dough is a deep gold at edges, 12-15 minutes.

Before serving, drizzle more purée over tarts and garnish with a sprinkling of chives.