http://allrecipes.com/recipe/amazing-pork-tenderloin-in-the-slow-cooker/
1 (2 pound) pork tenderloin
1 1/2 cups water
1/4 cup tablespoons soy sauce (gluten free)
1/2 cup red wine vinegar (or red wine or white vinegar)
3 tablespoons minced garlic
1 medium onion chopped and a handful of chives chopped
Rather than 1 (1 ounce) envelope dry onion soup mix