France has upped the ante in the quest for fusion power by maintaining a plasma reaction for over 22 minutes – a new record. The milestone was reached on February 12 at the Commissariat à l'énergie atomique et aux énergies alternatives (CEA) WEST Tokamak reactor.
Only difference between that and a burger is a burger is usually on a roll, not slices of bread. (And a burger is always hot, but then so are some sandwiches.)