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**Ingredients:**
- **For the Salisbury Steak:**
- 1 1/2 pounds ground beef
- 1/3 cup breadcrumbs
- 1/4 cup finely chopped onion
- 1 egg, beaten
- 1 teaspoon salt
- 1/2 teaspoon ground black pepper
- 2 tablespoons ketchup
- 1 tablespoon Worcestershire sauce
- 1/2 teaspoon mustard powder
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