In a large pot over high heat add the water, guava paste, butter and vinegar.
Cook for 10 minutes and stir constanly so it won't burn. Let it cool before storing.
Notes
Storage- Use a container, a condiment bottle, or a jar with a lid to store the salsa de guayaba. It is best to let it cool before storing it. I have saved the sauce in my fridge for a week. I have never left it for longer.
Reheating- To reheat the salsa de guayaba, you can either use the microwave or heat it up on the stove top on low heat.
Yield- The recipe yields about 1 ⅓ cups. The serving size is 2 tablespoons.