The actual taste was great but the hamburger fell apart. How'd you keep it in one patty?
This is an adulteration, and not in a good way. You should name it the heart healthy burger for cardiac patients, NOT a MINETTA burger, which this, in no way, resembles it's namesake. Start with the meat. In your opening description you state it's a Pat La Frieda blend of short rib and brisket (25-30% fat content), yet your recipe calls for ground sirloin (10% fat), which puts it in a position to make a nice hockey puck, not a juicy burger. You can actually order La Frieda burger blends online, BTW. Your recipe also calls for melted cheese. If you ever actually have dined at Minetta Tavern, you'd know they frown on adding cheese to their burgers, and let you know strongly.