Caramelized Onion Tart without vinegar

1 tablespoon butter or 1 tablespoon margarine 4 cups sliced sweet onions (such as Vidalia) 1 tablespoon light brown sugar 3 cups cooked rice 2/3 cup freshly[...]

1 tablespoon unsalted butter 2 tablespoons extra virgin olive oil 2 medium onions , thinly sliced 2 tablespoons fresh thyme leaves all-purpose flour , for[...]