Minced fresh parsley leaves, for serving (optional)
Gravy
1 tablespoon extra-virgin olive or vegetable oil
1/2 medium yellow onion, thinly sliced
10 ounces cremini mushrooms, thinly sliced
3 garlic cloves, minced
2 tablespoons all-purpose flour
1 teaspoon mustard powder
¾ teaspoon sea salt
¼ teaspoon garlic powder
¼ teaspoon onion powder
2 tablespoons unsalted butter
2 cups beef broth
2 teaspoons Worcestershire sauce
1 teaspoon Better Than Bouillon beef base or 1 beef bouillon cube
Freshly cracked black pepper
Method
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