1 part red wine vinegar
3 parts water
2-3 serrano peppers
Salt
Whole black peppercorns
1/2-1 tsp. garlic salt or 2-3 cloves garlic
Pinch oregano
Pinch comino
1-2 lbs. beef (chuck, round or sirloin), cut into 1 1/2 inch cubes
Bacon drippings