Step 1

In a large pot, soak beans overnight in 10 cups of water.

Step 2

Add 1 tablespoon oil, the onion, bell pepper, garlic cloves and bay leaf to beans, and bring to a boil. Lower heat to medium and simmer for 1 hour, checking regularly and skimming the foam that forms on top.

Step 3

Meanwhile, make the sofrito. Warm remaining 1/4 cup oil in a large skillet over medium heat. Add the half onion, 1 bell pepper and 3 garlic cloves and sauté for about 5 minutes until soft. Add 1 bay leaf, cumin, oregano, black pepper and salt, and cook for 2 minutes more.

Step 4

Add the sofrito to beans. Stir in sherry vinegar, wine and olives, and bring to a boil. Lower to a simmer and cook, covered, for about 1 to 1 1/2 hours, stirring frequently, until slightly thickened and cooked through. Remove both bay leaves, and adjust salt and pepper to taste. Remove from heat and add sugar. Serve as soup or a side dish, or over white rice.