When you buy an octopus, don't be fooled. Look carefully at its tentacles and count how many there are. The octopus has 8 tentacles and each has 2 rows of suckers. The cuttlefish has 10 tentacles and there is only one row of suckers. Cuttlefish is much cheaper than octopus, and all vendors are different.
If you don't want to stand over the pot, you can easily cook the octopus in the oven. To do this, wrap the octopus in several layers of foil leaving a small hole. Pour in 2 tbsp wine and 2 tbsp olive oil. Wrap the octopus in another layer of foil so that all the liquid that it lets out doesn’t leak. Bake the octopus in the oven for 30 minutes at 200˚C and then for another hour at 180˚C.