Black Beans Cuban Style - cooking recipe

Ingredients

1 lb. black beans
1/2 lb. onions (2 large onions)
5 oz. olive oil
2 Tbsp. salt or to taste
1/2 tsp. oregano
2 litres water
1/2 lb. green pepper, chopped
5 garlic cloves
1/2 Tbsp. cumin
1 oz. white vinegar

Preparation

Soak beans in water overnight.
Add salt and cook beans until soft.
In a mortar, mash the garlic; add to it the cumin, oregano and vinegar.