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 ...
Heat the skillet over a high flame and coat it lightly with oil. When the skillet is very hot, place the tuna fillets in it and sear them one side, then flip them over and sear the other side.
Air-frying your tuna steaks is both fast and efficient. It will mimic the ultra-high heat of a sear without dirtying a frying pan or turning on the stove. One pantry staple that'll maximize that ...