For the seasoning mix, put the nori sheets, garlic and chilli flakes into a food processor and blitz until the nori has broken up. Transfer into a bowl and add the white and black sesame seeds.

Place a grill pan (preferably well-seasoned cast iron ... Quickly assemble the ingredients: lay the nori slices on a plate and top each one with a shiso leaf. Place the seared beef on the shiso ...