1/3 cup canola oil
1 packet dry onion soup mix
5 tbsp worchestershire sauce
1 pork tenderloin
Mix oil, soup mix, and worchestershire sauce in a gallon-sized ziplock bag, and shake to combine. Then add pork tenderloin to the bag and seal. Place in the fridge and marinate for 2-4 hours.
When time to cook, Preheat oven to 375. Place large sheet of foil onto cookie sheet. Remove Bag from fridge, and place pork in center of foil, pouring remainder of marinade over tenderloin. Bring up long sides of foil, folding over twice at top, then fold in ends, forming a foil packet. Bake for 30-40 minutes, depending on size of tenderloin, until no pink is left in center.
Remove from oven, and open foil packet to vent. Allow to sit about 5 min, then remove to cutting board. Allow to sit for additional 5 min, then slice and serve.