INGREDIENTS
2 tbsp
butter
1 1/4 cups
mushrooms (thinly sliced)
1
onion (thinly sliced)
1 10 1/2 ounce can
condensed beef broth
1 1/2
lbs ground beef
1/2 cup
Panko bread crumbs
1
egg
1/4 tsp
black pepper
1 tbsp
all-purpose flour
1/4 cup
ketchup
2 tsp
Worcestershire sauce
1/2 tsp
mustard powder
1/3 cup
water