2 T Ketchup
2 T White Wine Vinegar
2 T A-1 Sauce
2 T Worcestershire Sauce
1 t Garlic Salt
1/4 c Sugar
1/2 t Ground Black Pepper
Dash of Hot Sauce (or more if you want it spicier)
One large onion, sliced
Lay out the onion slice in the bottom of the crock pot and put the tenderloin on top. If it has a "fatty side", lay that side down.
In a bowl, mix together the rest of the ingredients.
Pour the mixture over the pork loin, put the lid on the crock pot and cook on low 4-5 hours.