Name: Salisbury Steak
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Ingredients: 2 teaspoons olive oil; 1 cup yellow onion (minced); 2 pounds 93% lean ground beef; 1/2 cup plain breadcrumbs; 1 egg; 1 egg white; 2 cups low-sodium beef broth (divided); 1/2 teaspoon salt; 1/4 teaspoon pepper; 8 ounces sliced white mushrooms; 2 Tablespoons all-purpose flour; 2 Tablespoons tomato paste; 1 teaspoon red wine vinegar; 1 Tablespoon Worcestershire sauce; 1/2 teaspoon dry mustard; 1/4 cup water; 2 Tablespoons fresh parsley (chopped)