Choose a piece of tuna that's about 2.5cm (1in) thick. It has the best taste and texture if it's lightly seared so it's almost raw, and still a deep pink inside, but if you like it more cooked ...

This classic French Niçoise salad is full of flavour ... salt and pepper. Place the tuna in a shallow dish and pour over half of the dressing. Cover and chill for 1-2 hours to allow the fish ...