INGREDIENTS
1 1/2 lb
Ground beef, lean
8 oz
Cremini mushrooms
1
Onion, large
1/2 cup
Onions
1
Parsley, fresh
1
Egg
1 cup
Beef broth, unsalted
1
dry mustard [see note, dry
1/4 cup
Ketchup
4
Worcestershire sauce see note
3
cornstarch [see note
1 tsp
Black pepper, ground
1 tsp
Kosher salt
1
Salt and ground black pepper
2 tbsp
Olive oil
1 cup
Breadcrumbs
2 tbsp
Butter
1/4 cup
Milk or water
Optional garnish