steak and mushroom sandwiches

Steak and Mushroom Sandwiches

Makes 6 servings.

1 pound flank or sirloin steak
2 tablespoons vegetable oil
1 medium onion, sliced
2 medium portobello mushrooms, trimmed and sliced thin
1 teaspoon salt
1 teaspoon dried oregano
6 long sandwich buns (about 6 inches)
4 to 8 ounces mozzarella or other cheese, sliced
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