GRIND THE FENNEL, CORIANDER AND PEPPERCORNS IN A MORTAR AND PESTLE WITH A PINCH OF SEA SALT.
PRESS THE MIXTURE INTO BOTH SIDES OF THE TUNA STEAKS, WRAP IN WAX PAPER AND PLACE IN THE FREEZER FOR 30 MINUTES.
TRIM, PEEL AND FINELY DICE THE SHALLOTS AND PLACE IN A BOWL WITH A SPRINKLE OF SALT AND A TSP OF RED WINE VINEGAR.
QUARTER THE CHERRY TOMATOES. CORE AND DICE THE OTHER TOMATO. PLACE IN THE BOWL ON TOP OF THE SHALLOTS.
SLICE THE CUCUMBER LENGTHWISE IN HALF, THEN IN QUARTERS. CUT INTO 1/4 INCH DICE AND PLACE ON TOP OF THE TOMATOES.
ADD ABOUT A 1/3 CUP OF OLIVE OIL.
CHOP A HANDFUL OF PARSLEY LEAVES AND A HANDFUL OF CILANTRO LEAVES. FOLD INTO THE SALSA.
HEAT A CAST IRON PAN ON A HIGH FLAME FOR AT LEAST 3 MINUTES.
PLACE THE TUNA STEAKS IN THE PAN. (NO NEED FOR OIL) COOK OVER HIGH HEAT FOR ABOUT 3 MINUTES, THEN TURN AND COOK ABOUT 3 MINUTES ON THE OTHER SIDE. YOU WILL SEE THE TUNA COOKING, SO YOU CAN DECIDE YOURSELF HOW RARE YOU'D LIKE IT. I LIKE IT REALLY RARE IN THE CENTER.
REMOVE TO A SERVING PLATTER AND ALLOW TO REST FOR 10 MINUTES.
SLICE TUNA ACROSS THE GRAIN WITH A VERY SHARP KNIFE (SUSHI KNIFE IS PERFECT).
SERVE WITH BEANS, SUGAR SNAP PEAS OR BROCCOLINI AND NEW POTATOES. PUT THE SALSA IN A BOWL AND PASS IT AROUND.
SERVES 2-4 DEPENDING ON HOW MUHC TUNA YOU'VE GOT.
