Clean, peel and thinly slice the celery, carrot and pepper. Place in ice and water. Cut the tuna into 3 equal parts, add a drizzle of oil and coat with the sesame mix, making sure all sides are covered.

Place a sheet of greaseproof paper into a preheated non-stick pan and roast the tuna for about 3 min. on each side.

Using a hand blender, blend the basil and mint leaves with 3 tablespoons of extra-virgin olive oil. Transfer the mixture to the pan and add the beans, adjust the salt and brown for 3 min.

Cut the tuna into small slices and arrange on the plate. Add the crudité of vegetables (discarding the water) and the sautéed cannellini beans. Finish off the dish by adding a little sea salt onto the tuna.