Caramelized Onion Tartlets

7 ingredients
4 steps

Ingredients

  • 2 teaspoons olive oil
  • 2 small red onions, thinly sliced
  • 2 small yellow onions, thinly sliced
  • 1 tablespoon white balsamic vinegar
  • 1 sheet frozen puff pastry dough, thawed
  • 1/3 cup shredded Asiago cheese
  • 1/4 teaspoon kosher salt

Directions

  1. 1
    Heat oil in a skillet over medium-high heat. Add onions; saute 5 minutes. Reduce heat to medium. Cook for 15 minutes; stir occasionally. Add vinegar.
  2. 2
    Preheat oven to 400°.
  3. 3
    Unfold dough, and place on a work surface lightly dusted with flour. Roll into a 10 x 9-inch rectangle. Cut dough into 20 (2 1/4 x 2-inch) rectangles. Score each rectangle about 1/8-inch from edge. Prick dough pieces liberally with a fork. Arrange on a baking sheet lined with parchment paper; chill 10 minutes.
  4. 4
    Sprinkle about 3/4 teaspoon cheese over each tartlet; top with about 1 tablespoon onion mixture. Sprinkle with salt. Bake at 400° for 15 minutes or until dough is lightly browned.

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