Can I/or how do I cook two steaks at once to different levels of doneness?
No, because ‘doneness’ is a factor of temperature. But there are ways around it.
There are a couple of ways it can be achieved:
Option 1: Cook the more done steak for an hour at the higher temperature. You’ll then need to cool off the water bath with some ice to bring the temperature rapidly down to what is required for your own steak. When the temperature is low enough, drop the second steak into the bath and cook for your desired time which is most commonly 2 hours. When you are ready to finish the steaks dry well and sear and serve.
Option 2: Cook both steaks to the medium rare for the full duration. When time comes for finishing dry both steaks and work on the more done steak first. It will require a bit more cooking during the searing process to bring it up to his desired done-ness. The rarer steak can be seared and served as normal.
These are the simplest options with one cooker with Option 1 being the most reliable.
Thank you for the quick response!