Ingredients
• 6 ounces minced剁碎onion
• 1 ounce minced garlic
• 3 tablespoons butter
• 2 pounds ground beef
• 4 eggs
• 8 ounces bread crumbs
• 4 ounces chopped flat leaf parsley
• 12 ounces cooked and diced button mushrooms
• 2 ounces butter
• 2 ounces flour
• 24 ounces chicken stock
• 1 pound sliced button mushrooms
• 2 red onions, sliced 1/2-inch thick, grilled
Directions
Saute onions, and garlic in 1 tablespoon butter until translucent半透明 and set aside to cool. Mix beef with cooled onion mixture, eggs, bread crumbs, parsley, and mushrooms. Form into 4-ounce patties and saute in the remaining 2 tablespoons of butter until golden brown on both sides and set aside. In saucepan melt熔化 2 ounces of butter and add flour and cook over low heat for 1 minute until wet sand consistency黏度. Begin to add stock 1/3 at a time whisking搅拌 and bringing to simmer each time making sure there are no lumps块，团. Add mushrooms and simmer慢慢烧滚for 1/2 hour. Place patties in a roasting pan and pour gravy over patties and bake in a preheated 375 degree oven for 45 minutes. Garnish装饰 with grilled onions and serve.
