Turn on the broiler and pre-heat the grill.
Smash the garlic and mix with the vinegar and oregano. Transfer the marinade to a baking dish. The size of the dish will depend on the size of the octopus you are using.
Place the octopus in the marinade and cover it with olive oil. Leave for at least a few minutes.
Remove the octopus from the marinade. Broil it on high for about 35 minutes, until it is soft and slightly blackened.
When the octopus is done broiling, remove it from the oven.
Lower the heat to low and add the marinade for a few minutes. Let it sizzle until the alcohol burns off.
When the marinade starts sizzling, transfer the octopus to a serving dish. Cut it into small pieces before presenting it to your friends.
Serving Suggestions: Serve them as a starter, with crusty French bread and olives.