The added butter in these hamburgers really brings out the flavor. My go-to standard hamburger gives a nod to Culver's fast food chain. Once I tried their butterburgers I just had to bring it home.
Preheat grill to medium-high.
In a large bowl, mix together beef, onion, garlic, parsley, Worcestershire sauce, and Dijon mustard. Season to taste with cayenne pepper, salt, and black pepper.
Form into 2 8-ounce patties. Flatter burgers will cook faster and more evenly.
Grill burgers for 4 to 5 minutes per side for medium-well.
Brush burger buns with melted butter and grill cut side down until crisp and golden brown.
Serve with your favorite burger garnishes.