Pork tenderloin usually comes in a bag of 2. I usually marinate them separately, each in a gallon size freezer bag. This is the marinade per bag, so double if marinating together.
1 pork tenderloin
Marinade
2 tsp olive oil
2 T finely chopped onion
4 T hoisin sauce (found in Asian section of grocery store)
4 T soy sauce
2 tsp sesame oil
1 tsp Sriracha sauce
1/4 tsp onion powder
1/4 tsp garlic powder
1. Combine marinade and pork in a ziploc bag and marinate 3-4 hours or as long as possible.