Bring a large stock pot with a lid to the heat, add about 7 tablespoons of olive oil to the pot, then add garlic, chilli, parsley stalks and lemon rind.
Fry slowly for a minute or two without browning the garlic, then add the octopus to the pot.
Give the pot a shake, put a lid on it and turn the heat down to a steady but slow simmer.
The octopus will become tender over the next 15 - 20 minutes, depending on the size.
Lots of liquid will cook out, making a delicious broth.
To check on its tenderness, stick a fork into it and if it slides through it’s ready. If not leave it to simmer a little longer.
When it’s cool enough to handle, slice into 1 inch pieces and char-grill quickly on a hot griddle with oil.
Splash with lemon and season with salt and pepper.