Slow Cooker Pork Tenderloin

This pork is tender and flavorful.  It can be eaten by itself or as a delicious au jus pulled pork sandwich.

2 Medium Onions, sliced
Olive Oil
1 1/2-2 lb Pork Tenderloin
3-4 Tbsps Dijon Mustard (I love Grey Poupon Country Dijon)
1/4 Cup Brown Sugar
2 Tbsps Cider Vinegar
1 Tsp Dried Thyme

Place onions and about 2 tbsps of olive oil in the bottom of the slow cooker.  Place the pork tenderloin on top of the onions.  Salt and pepper the pork generously.  In a separate bowl mix together the mustard, brown sugar, vinegar and thyme.  Pour the thick mustard mixture over the pork.  Cook on low 7-8 hours, flipping the pork over once halfway through the cooking process.