1/3 cup onion, chopped (divided)
1/2 teaspoon freshly ground black pepper
1/4 teaspoon kosher salt
2 garlic cloves, minced
1 pound ground beef
1 tablespoon butter
2 cups cremini mushrooms, quartered
1/3 cup dry red wine
2 cups beef stock
1 tablespoon flour
Combine 1/4 cup onion, pepper, salt, garlic, and beef.
Shape into 4 patties.
Heat oil in skillet over medium-high heat.
Add patties; browning on each side (about 3 minutes).
Remove and set aside tenting with foil to keep warm.
Melt butter in the pan.
Add mushrooms and saute until tender.
Stir in wine and remaining onion and cook a couple of minutes until onion is tender.
Combine broth and flour.
Add to pan and bring to a boil.
Cook until thickened.
Add patties to pan and simmer a few more minutes to heat beef through. (Serves 4)