Clean and wash the octopus. Place the octopus in a colander and drain. Put octopus in a saucepan without water because it releases its own juices. Cook over medium heat until the octopus is tender. Strain any remaining liquid, add olive oil and sauté lightly. Add the rest of the ingredients and some of the liquid. Simmer until sauce has thickened.
Octopus contains less fat than fish but remains a good source of omega-3 fats. It also contains a number of vitamins, main minerals and trace elements, such as calcium, phosphorus, zinc, selenium and iodine. However, octopus is high in cholesterol as well. Balsamic vinegar has antioxidant properties and contains more sugars than any other type of vinegar. It also has calcium, iron, magnesium, phosphorus and sodium. Black currants are a good source of antioxidant substances.