Caramelized Onion Tartlets

• 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

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. Preheat oven to 400u0b0.
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. Sprinkle about 3/4 teaspoon cheese over each tartlet; top with about 1 tablespoon onion mixture. Sprinkle with salt. Bake at 400u0b0 for 15 minutes or until dough is lightly browned.

olive oil, red onions, yellow onions, white balsamic vinegar, pastry, cheese, kosher salt

Taken from www.myrecipes.com/recipe/caramelized-onion-tartlets (may not work)