Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      pounds        beef tri-tip
                        ***MARINADE***
     1/2  cup           dark Mexican beer
     1/2  cup           basic vinaigrette
     3/4  cup           soy sauce
   4                    chile tepin peppers
   3      cloves        garlic minced
   1      teaspoon      dark brown sugar
     1/2                white onion -- diced
   1      tablespoon    white vinegar

Preparation:

Whisk all ingredients together well. Place tri-tip in a glass baking dish and cover with marinade. Marinate for at least 4 hours, better overnight. Grill to desired degree of doneness.