Black beans can be enjoyed in many, many ways, but the two most common ways they are enjoyed in Guatemala is whole beans (parados) often in a soup form or refried (volteados). This recipe is how my family makes them.
Soak beans over night or at least 4 hours in a pot.
Cut the ends off an onion and peel a garlic clove place them in the pot with beans. Add some salt (start with about a tsp then taste once cooked and add more accordingly). Add enough fresh water to cover your beans and most onion.
Bring water to a boil then simmer for about an hour and a half or until beans are tender.