Caramelized Onion without rolls reggiano

itemscope itemtype="http://data-vocabulary.org/RecipeIngredient"> 5 cups (1-inch) cut green beans (about 1 pound) Cooking spray 3 cups thinly sliced onion 6[...]

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[...]

2 tablespoons extra-virgin olive oil 1 medium red onion, thinly sliced 2 tablespoons balsamic vinegar 1/4 teaspoon salt 1/4 teaspoon freshly ground black[...]