Roast Beef Sandwiches With Caramelized Onion

1 teaspoon olive oil 1 vidalia onion, cut into strips 6 teaspoons honey mustard 6 slices rye bread 6 ounces roast beef 1 Cook the onion in the oil in a large[...]

3 teaspoons unsalted butter or 3 teaspoons unsalted margarine 1 large onion , finely sliced 3/4 lb button mushroom , sliced 1 garlic clove , minced 1 cup[...]