Combine black beans, pineapple juice, diced bell pepper, tomato (or ketchup), chopped scallions, lime juice, minced garlic, salt, cinnamon, and black pepper in a pot.

Stir all the ingredients together thoroughly.

Simmer the mixture over medium-low heat, allowing the liquid to reduce until most of it is cooked down (approximately 45 minutes). Stir occasionally to prevent sticking.

Remove the pot from the heat.

Stir in the chopped cilantro.

Serve hot and enjoy.