Caramelized Onion with crumbs

3/4 pound mild Italian sausage , uncased 6 large Vidalia onions, sliced thinly 3 tablespoons olive oil 3 tablespoons margarine 2 teaspoons salt 1 13.8 ounce[...]

1 large yellow onion , peeled and thinly sliced 1 sheet puff pastry , thawed 1/3 cup blue cheese , crumbles 3/4 cup steak, leftover cut into small pieces 2[...]