Remove silver skin from pork tenderloin
Season cleaned tenderloin well with kosher salt and black pepper
Mince garlic cloves and shallot
Finely slice sage
Combine tenderloin, butter, 1 tbsp olive oil, garlic, shallot, and sage in a ziploc bag.
Remove all the air from the bag and seal.
Marinate for 1-4 hours
When done marinating, set sous vide bath to 140F.
Once at temp, add bag of tenderloin to the bath and cook for 1 hour
After 1 hour, remove from bath and rest for 10 minues
Place a cast iron skillet over medium high heat. Get pan hot then add olive oil. Get the oil hot then add the tenderloin.
Sear the tenderloin on all sides. ~ 1 minute a side.
Rest for 5 minutes.
Slice and serve!