Medium-rare burgers are cooked to 130 degrees Fahrenheit ... should be more than enough for a perfect, juicy burger. Additional ingredients like onions, bread crumbs, and eggs can be just fine ...
Historians have suggested that the hamburger can be traced back to one ... There, they encountered a vendor “grilling up patties, 30 or so at a time, and there was a line,” Rodbard said.
the version that developed in Japan has the hamburger steak shaped like patties with the taste and texture of meatloaf. My recipe uses “panko” breadcrumbs and onions, and it’s very juicy.