Rustic Onion Tart

Directions

1. 1
   {"0":"1. Pprepare the dough and let it chill in the refrigerator while you are cooking the onions.","2":"2. Peel and slice the onions.","4":"3. Preheat oven to 325. Heat olive oil and butter in a large, heavy-bottomed dutch oven on medium heat. Once the butter has melted, add the onions and sprinkle a little salt over them. Cook, stirring occasionally for 10 minutes, until the onions have softened and are translucent. Transfer onions to oven and cook for an additional 40 minutes, stirring occasionally, until the onions are well browned. Add balsamic vinegar and cook for 10 minutes more, until onions are completely caramelized. Remove from heat.","6":"4. Preheat the oven to 450\u00b0F. Remove the dough from the refrigerator and let stand for","7":"5 minutes before rolling it out. Roll out the dough on a lightly floured surface to a 10-inch diameter. Remove the crust dough to a cookie sheet lined with parchment paper.","9":"5. Place all but a couple tablespoons of the cheese in the center of the dough. Spread to within 1 1\/2 inches from the edges. Add the caramelized onions, layering them on top of the cheese. Fold the edges of the crust dough over so that a small circle of onion is still showing in the centre of the tart. Sprinkle the remaining cheese over the top of the tart.","11":"6. Place in the oven on the middle rack. Bake for 10 minutes at 450\u00b0F. Reduce the heat to 350\u00b0F and bake for an additional 20-25 minutes, until the crust is golden brown. Remove from oven and let sit for 10 minutes before serving."}