Buongiorno Andy,
Thank you for your thread.
Firstly, I would only eat a blue rare Filet Mignon, Wagyu or Prime Rib Eye Steak in this fashion, blue rare ... I love Steak Tartar and Beef Carpacchio.
I have never eaten hamburgers nor shall I. It was never a dish, my Mom or Grandmom served in our house growing up and thus, the culture of a hamburger and fast food had never really existed. Pizza was our fast food or a re-heated lasagne or Provolone or Proscuitto di Parma on a Hero ... baguette ...
I have of course, eaten and I have prepared Italian Meatballs and Italian Meatloaf and traditional Emilia Romagna Bolognese all my life, and the ground beef mixed with ground pork should be well cooked.
Have a lovely weekend.
Ciao,
Margaux Cintrano.