I should know better, especially being a microbiologist , but the preferred way (at least for the youngest and myself) to eat beef is to cut the meat into cubes, soaking it in teriyaki sauce and eat it raw. I do (sort of) cook beef, but it is always red in the middle, just has so much more flavor.

My son-in-law, my oldest and wife require I cook the meat to at least medium-rare (what a waste of good meat), while my middle, youngest and I prefer the meat on the very rare side.

My rule of thumb: just show it to the flame and if it is not mooing, it is perfect .

Pete