Ingredients: 
1 pound boneless beef sirloin steak, cut 1-inch thick
2 tablespoons vegetable oil
1 tablespoon each fresh lemon juice and water
2 teaspoons Dijon-style mustard
1 teaspoon honey
1/2 teaspoon crushed dried oregano
1/4 teaspoon ground black pepper
1 medium green, red or yellow bell pepper, cut into 1-inch pieces
12 to 15 whole white or crimini mushrooms, cleaned and trimmed