Pre-heat your oven to 200ºC.

Place your fillets in an oven proof dish on a splash of olive oil so as they do not stick.

Toast the wholegrain bread slices. Turn them into breadcrumbs, using a food processor or a simple kitchen knife.

Combine breadcrumbs, pesto, olive oil and parmesan until you get a thick crumbling paste texture. Spread it on the cod fillets.

Bake in the over for about 15 minutes until the cod is cooked through and the topping is crisp and golden on top.