
This timeless Salisbury Steak dish is generously coated in rich mushroom gravy and can be prepared in less than half an hour!
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Heat oil in a pan over medium heat and cook the onions until they turn a rich golden brown, approximately 5 minutes.
In a spacious mixing bowl, combine half of the cooked onions, ground beef, ground turkey, breadcrumbs, the whole egg, egg white, 1/4 cup of beef broth, salt, and black pepper. Form the mixture into 8 oval-shaped patties.
In a large, deep skillet set over medium-high heat, sear the patties on both sides until browned, roughly 4 to 5 minutes per side, working in batches if necessary. Once browned, transfer them to a plate.
Toss the mushrooms into the skillet, season with salt and pepper, and sauté for 2-3 minutes until they soften.
Place the browned patties back into the skillet along with the mushrooms.
In a small bowl, whisk together the flour and the remaining beef broth until well combined. Stir in the leftover onions, tomato paste, vinegar, water, Worcestershire sauce, and mustard powder. Pour this mixture over the meat and mushrooms in the skillet.
Cover the skillet and allow it to simmer on low heat for 20 minutes, stirring occasionally to ensure even cooking.