Potato and braised octopus salad

1.For braised octopus, combine octopus and remaining ingredients in a large saucepan and cover with cold water. Bring to the boil over high heat, reduce heat to low, cover, simmer until tender (25-30 minutes). Drain octopus, reserving 50ml braising liquid, and cool to room temperature, then cut into 5cm pieces.

2.Meanwhile, place potatoes in a saucepan, cover with salted water and bring to the boil over high heat, reduce heat to medium, simmer until tender (8-10 minutes). Drain and, when cool enough to handle, cut into 5cm pieces.

3.Thinly shave fennel and onion on a mandolin and combine in a bowl with parsley, radicchio, potato and octopus. Whisk reserved braising liquid and egg yolk in a bowl until pale and frothy. Whisk in extra-virgin olive oil in a thin stream until combined and season to taste. Drizzle over salad, toss to combine and serve.