Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/4  cup           red wine vinegar
     1/4  cup           olive oil
     1/4  cup           catsup
   2      tablespoons   soy sauce
   2      tablespoons   worcestershire sauce
   1      teaspoon      rosemary
   1      teaspoon      garlic powder
   1      teaspoon      dry mustard
                        beef pot roast

Preparation:

Mix ingredients well in a blender, and pour over your pot roast. Cook until tender.