Saute mushrooms in 1/2 stick of butter. Mix ground beef with spices thoroughly. Fashion into thin patties (1/4"); 5 inches in diameter as they will shrink and get "thicker" after grilling. Grill until desired doneness. Garnish with mushrooms, tomatoes, Sharp cheddar cheese and lettuce. Serve on an Onion roll. Purple onion slices are optional for those who enjoy that sweet onion. Hamburgers tend to get a little boring but this will change your mind about the traditional burger. Note: This is not a "Hot" burger, so stay with the spices. It is a little extra trouble with all the ingredients but it is relished by my family. Hope yours enjoy it too. Joey Aguzin in New Awlins.