Caramelized Onion Tartlets

Ingredients

• 0.3 cup asiago cheese shredded
• 0.3 teaspoon kosher salt 
• 2 teaspoons olive oil 
• 1 sheet puff pastry frozen thawed
• 2 small onion red thinly sliced
• 1 tablespoon balsamic vinegar white
• 2 small onion yellow thinly sliced

Equipment

• frying pan
• baking sheet
• baking paper
• oven

Directions

1. Heat oil in a skillet over medium-high heat.
2. Add onions; saut 5 minutes. Reduce heat to medium. Cook for 15 minutes; stir occasionally.
3. Add vinegar.
4. Preheat oven to 40
5. Unfold dough, and place on a work surface lightly dusted with flour.
6. Roll into a 10 x 9-inch rectangle.
7. 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.
8. Sprinkle about 3/4 teaspoon cheese over each tartlet; top with about 1 tablespoon onion mixture.
9. Sprinkle with salt.
10. Bake at 400 for 15 minutes or until dough is lightly browned.