Ingredients 

1 Pork tenderloin

Ingredients Mustard Sauce 

2/3 cup sour cream
2/3 cup mayonnaise
2 tbsp. dry mustard
2 tbsp. chopped green onions
2 tsp. vinegar

Instructions

Mix all ingredients   together. Refrigerate for several hours or overnight to develop flavors.

MARINADE:

1/2 c. soy sauce
1/2 c. bourbon
4 tbsp. brown sugar

Combine all   ingredients in a bowl large enough to accommodate meat. Pierce tenderloin all   over with a large fork and place in marinade for several hours or overnight.   Turn occasionally.

Preheat oven to 375   degrees. Flour a see-through roasting bag. Place meat in roasting bag; seal   and pierce several times with a fork so that steam can escape. Bake at 375   degrees for 1 hour.

Carve meat into thin   slices. Serve with mustard sauce, which may be hot or cold.