INGREDIENTS
1 tsp
olive oil
1 tbsp
unsalted butter
1 1/2 cups
chopped mushrooms
1/2 cup
diced onions
1 tsp
rosemary
2 tsp
minced garlic
2 tsp
Worcestershire sauce
kosher salt and black pepper
1 lb
butterflied flank steak
1 1/2 cups
fresh spinach
1/2 cup
seasoned breadcrumbs
1/4 cup
melted unsalted butter
Toothpicks for securing