Brushed the steaks with olive oil and season with salt and pepper. Heat a large griddle or non-stick frying pan to medium-high heat.
Cook the steaks on each side for about 3 – 5 minutes depending on the thickness. If you want the steaks to be pink in the middle, ensure you take them off the heat in time. They will carry on cooking a bit after they have been removed.
Put the butter, capers, parsley, and lemon juice in a small pot and bring to a bubble. Pour this over the seared tuna steaks to serve. Garnish with caperberries and lemon wedges.
Boiled new potatoes tossed in butter and parsley are an excellent side for this dish as is cooked asparagus and a green salad.