I bought a pork tenderloin at  the store today, it seemed pretty big – I thought it was two packed into the same bag like they do.  Nope!  I decided to do the sous vide thing because tenderloins are so easy to overcook doing them the regular way.  I set my circulator to 150 degrees and left it in for 3-1/2 hours.  No marinade, just salt and pepper, and I enclosed a sprig each of thyme and rosemary.It came out with just a bare hint of pink.  I’m pretty old school and a bare hint is about all I can tolerate despite assurances that 145 degrees is the new, safe, temperature for pork.  The Serious Eats guy has a pretty good take on sous vide pork here.  They have a pretty good color chart, 150 degrees is considered medium well done.  I made a simple pan sauce by reducing some of the liquids that collected in the bag and adding a pat of butter.  It didn’t really need anything, juicy as it was.  I can’t get enough of these fried potatoes.  I par boiled them for five minutes then cooled them in running water.  Dry them on a towel and fry them in duck fat if you can  get some, you will not be disappointed.