First, if you’ve purchased whole octopus, begin by cleaning it. Remove the beak and innards carefully. Rinse it under cold water to ensure it's clean.
To tenderize the octopus, bring a large pot of water to a boil. Add a bit of vinegar and a pinch of salt. Once boiling, add the octopus and reduce the heat. Simmer for about 45 minutes. This step guarantees a tender outcome.
While the octopus cooks, combine the lemon juice, garlic, capers, smoked paprika, oregano, salt, and pepper in a bowl. Whisk in a few tablespoons of olive oil until everything is well combined.
Once the octopus is tender, remove it from the pot and let it cool slightly. Cut it into smaller pieces (arms or body). Place the pieces into the bowl with the marinade, ensuring they’re well-coated. Let them marinate for at least 30 minutes, but if you have time, longer is better.
Preheat your grill to medium-high heat. Lightly brush the grill grates with olive oil to prevent sticking. Place the marinated octopus on the grill and cook for about 3-4 minutes on each side. Look for that beautiful char to form.
Once grilled, remove the octopus from the grill. Sprinkle a little more chopped parsley over the top for a fresh touch. Serve immediately with lemon wedges on the side for that extra zing.