Rinse the thawed octopus tentacles and pat them completely dry with paper towels. This is crucial for getting a good char.
In a large bowl, whisk together the olive oil, minced garlic, lemon zest, lemon juice, dried oregano, smoked paprika, salt, and pepper.
Add the dry octopus to the marinade and toss gently to coat. Let it sit for 15-30 minutes at room temperature.
Preheat your grill to high heat. It should be very hot before you start cooking.
Place the octopus tentacles directly on the hot grill grates. Cook for 3-5 minutes per side, until you have deep char marks and the suckers are slightly crispy.
Remove the octopus from the grill and let it rest on a cutting board for a few minutes.
Serve the tentacles whole or sliced into bite-sized pieces. Garnish with fresh parsley, a final drizzle of olive oil, and extra lemon wedges on the side.
Notes
The key to this quick recipe is using pre-cooked octopus tentacles, which can be found in the frozen seafood section of most well-stocked grocery stores.