Latin American
Heat the oil in a large frying pan over medium heat and fry the onion and bell pepper for 5 minutes until soft.
Add the garlic and fry for 1 minute more.
Add the black beans with the bean cooking liquid and simmer for 3-4 minutes, until the liquid has reduced by about half and turned dark.
Add the cold rice, breaking up any clumps, and fold it into the beans until every grain is colored by the bean liquid.
Cook for 5-8 minutes, stirring now and then, until the rice is hot and the mixture is fairly dry; season with salt.
Stir in the cilantro and serve hot, for breakfast with fried eggs and sour cream or as a side to meat or fish.