Rinse the black beans under cold water to remove any dust or debris.

Soak the beans overnight in plenty of water.

Cook the soaked beans in a large pot with fresh water over medium heat. Bring to a boil, then reduce to a simmer and cook until tender, about 1 to 1.5 hours.

Sauté diced onion and garlic in olive oil until fragrant and translucent, about 5-7 minutes.

Combine the cooked black beans with the sautéed mixture. Stir in cumin, salt, and pepper, allowing the flavors to meld together for about 10 minutes on low heat.

Serve hot with your favorite toppings like avocado, cilantro, or lime wedges.