Authentic cuban black beans recipe: Abuela's Secret!

Ingredients

• 1 pound (450g) dried black beans, rinsed
• 2 tablespoons (30ml) olive oil
• 1 medium onion, finely chopped (approx. 1 cup/150g)
• 1 medium green bell pepper, finely chopped (approx. 1 cup/150g)
• 4 cloves garlic, minced
• 1 teaspoon (5ml) dried oregano
• 1 teaspoon (5ml) ground cumin
• 1 bay leaf
• 6 cups (1.4L) chicken broth or vegetable broth
• 2 tablespoons (30ml) white vinegar
• 1 teaspoon (5ml) sugar (optional)
• Salt to taste
• Black pepper to taste
• Chopped fresh cilantro (optional)
• Sour cream or Greek yogurt (optional)
• Sliced avocado (optional)