Do Puerto RIcan use the water from the soaked beans to boil the rice?
When cooking rice and beans together, a combination of spices (onions, garlic, green pepper, tomato paste, olives and other spices) are saute, the beans with the water they had been soaking in are then put in and finally the rice if it needs more water it is added. So yes one will say that the rice is boiled in it. On the other hand you don’t want the beans to soak for too long (12-24 hours the most), if they do it will be best to dispose of it rinse the beans and cook with new water.