In a small mixing bowl, combine guava paste, pepper, cayenne pepper, ¼ teaspoon of salt, and vinegar.Add boiling water and using a spatula dissolve the guava paste until it's smooth and well-combined.Add ketchup and stir to combine.
Serving
Serve alongside your favorite grilled meat, or use as a pre-grill rub for pork, chicken, and even sausages.
Cook's notes
This yields about half a cup, increase the ingredients in proportion to make more.