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Sauté onions, and garlic in 1 tablespoon butter until translucent and set aside to cool.
Mix beef with cooled onion mixture, eggs, bread crumbs, parsley, and mushrooms.
Form into 4 ounce patties and sauté in the remaining 2 tablespoons of butter until golden brown on both sides and set aside.
In saucepan melt 2 ounces of butter and add flour and cook over low heat for 1 minute until wet sand consistency.
Begin to add stock 1/3 at a time whisking and bringing to a simmer each time making sure there are no lumps.
Add mushrooms and simmer for 1/2 hour.
Place patties in a roasting pan and pour gravy over patties and bake in a preheated 375° F. oven for 45 minutes.
Garnish with grilled onions and serve.