Soak the beans in a bowl of water in the refrigerator for 12 hours. Then rinse and boil in salted water. Once cooked, drain the beans, but keep the boiling water, and process the beans in a blender, gradually adding more of the boiled water until you get a smooth cream. Add salt to taste.
Fry the egg in a pan with a little oil.
Place the fried egg on top of the mashed beans, add the lettuce, oregano leaves and season with paprika and salt.