Caramelized-Onion Tart with Asparagus

Easy and delicious....need I say more.

Caramelized-Onion Tart with Asparagus

2 tbs olive oil
1 tbs butter
1 red large red onion, thinly sliced into rounds
1 tsp granulated sugar
1/2 tsp salt
2 tsp balsamic vinegar
1/2 package frozen puff pastry, thawed
1 egg
1/2 bunch asparagus, trimmed and sliced in half length wise
1/2 cup pitted kalamata olives, sliced
1 cup finely grated asiago cheese

Heat a non stick frying pan over med heat.  Add 1 tbs olive oil, butter, and then onion.  Sprinkle with sugar and 1/8 tsp salt.  Cook stirring occasionally, until caramel colored, about 12-15 minutes.  Remove from heat and stir in vinegar.

Pre heat your oven to 400 degrees.  Line a baking sheet with parchment paper.  Roll out pastry on a lightly floured surface into a 14x10 inch rectangle.  Pastry will be thin, and edges will be uneven.  Transfer to lined baking sheet.  Beat egg with 1 tbs water in a small bowl.  Lightly brush pastry with egg wash.  Set aside.

Drizzle asparagus with the remaining oil and salt.  Season with fresh pepper and toss.

Scatter caramelized onion and olives over pastry.  Sprinkle with half the cheese.  Arrange asparagus spears in 2 parallel rows on cheese.  sprinkle with remaining cheese.

Cook for 10-15 minutes or until crispy and golden brown.