Buy a large octopus, so the legs are around 4-5cm thick. Slice of the legs of the octopus and peel off the skin. Place the legs into a pot of boiling salty water for 40 minutes.
Remove the octopus legs from the water and roll 3 legs together tightly with a Japanese sushi mat. There will be 3 separate layers forming a flower like shape. Tie the mat tightly and place in the fridge for at least 6 hours.
Remove from fridge and untie mat. Thinly slice the legs into pieces and place 6 pieces on each plate.
Drizzle the octopus with lemon juice and olive oil (mixed together) and sprinkle with red miso and shiso around the sides of the place.