Caramelized Onion Tarts

• 6 tbsp (3/4 stick) butter
• 2 tbsp olive oil
• 3 medium onions, thinly sliced
• 2 tbsp balsamic vinegar
• 2 tbsp brown sugar
• 2 sheets frozen puff pastry, thawed
• 4 oz sliced pepperoni
• 1 cup crumbled feta cheese
• None None Baby spinach and oregano leaves, to serve

1. Preheat the oven to 350u0b0F. Line 2 baking pans with parchment paper.
2. Heat butter and oil in a large skillet on medium heat. Saute onions 15-20 mins, stirring occasionally, until softened and lightly golden. Add vinegar and sugar. Cook, stirring, 4-5 mins until liquid evaporates and sugar caramelizes.
3. Place pastry sheets on prepared pans. Spread onions on each sheet, leaving 1/2-inch border. Top with pepperoni and feta.
4. Bake 20-25 mins, until pastry is crisp and golden.
5. To serve, cut each tart into quarters. Sprinkle with spinach and oregano leaves.

butter, olive oil, onions, balsamic vinegar, brown sugar, pastry, pepperoni, feta cheese, oregano

Taken from recipes-plus.com/api/v2.0/recipes/30910 (may not work)