With a good knife, cut the roast into thin slices, about ⅛ inch thick.
½ lb lean top round or sirloin beef roast
Combine the water, garlic, cayenne pepper, sea salt, black pepper, chili powder, and Worcestershire sauce in a bowl.
1 clove garlic, ¼ teaspoon cayenne pepper, ¼ teaspoon sea salt, ½ teaspoon freshly ground black pepper, 1 teaspoon chili powder, ¼ cup Worcestershire sauce, 2 tablespoon water
Add the beef slices to the mixture, cover, and refrigerate overnight for the flavors to penetrate the meat.
Place the beef slices, without their marinating liquid, side by side on baking sheets and roast in a 175 F oven for about 3 hours.
Turn the meat over and roast for another hour or two until the meat is dry but still bends without breaking.
Enjoy and place the leftovers in an airtight container in the refrigerator.