Heat the light olive oil in a heavy-based frying pan to smoking hot. Season the tuna really well then fry for a minute each side.
In a separate pan heat the extra virgin olive oil, add the chilli flakes and anchovy filets and fry for 30 seconds then add the tomatoes, allow them to cook until just beginning to soften then throw in the olives and just heat through. Season with a little salt (remember the anchovies are salty) and plenty of black pepper then stir in the basil.
Remove the tuna from the pan and allow to rest in a warm place. Add the remaining extra virgin olive oil to the pan along with the garlic. Cook very briefly then add the breadcrumbs with plenty of seasoning. Cook over a high heat until the breadcrumbs are beginning to get really crispy then stir in the lemon zest. Cook briefly before stirring in the parsley.
To serve spoon the sauce onto the centre of each plate, place a tuna steak on top and finish with a sprinkling of the crispy breadcrumbs.
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