How can I ensure a juicy beef burger patty?
Using a coarse grinder attachment. Take the meat straight from grinder, leaving it with the grain from grinder like a "log". Do not mix it up. Do not add any extra ingredients after grinding

If your grinder output is not very wide, make three or four "logs", and lay them parallel to each other to make a cluster

Cut the burger patties across the grain of the "log", and gently press the outside edge inward to hold the disc shape

Cook on high heat till rare or medium rare, and enjoy