Ingredients: 1 lb (500 g) ground beef (80% lean) 1 onion, finely diced 2 garlic cloves, minced ⅓ cup...

Ingredients:
1 lb (500 g) ground beef (80% lean)
1 onion, finely diced
2 garlic cloves, minced
⅓ cup Panko breadcrumbs
1 large egg
⅓ cup tomato sauce (marinara)Gravy
1 teaspoon yellow mustard
1 teaspoon Worcestershire sauce
1 teaspoon dried oregano
¼ teaspoon ground black pepper
Salt, to taste
For the Mushroom Gravy:
1 tablespoon vegetable oil
1 onion, sliced
9 oz (250 g) white button mushrooms, sliced
2 ½ cups low sodium beef broth
1 teaspoon onion powder
½ teaspoon garlic powder
1 ½ teaspoons Worcestershire sauce
3 tablespoons cornstarch mixed with ¼ cup water (or beef stock)
Salt and pepper, as needed