4 Mackerel Fillets
A knob of butter
Salt & Pepper
Heat some olive oil in a frying pan & add the mackerel fillets, seasoning with salt & pepper.
Cook on medium heat for about 15 minutes, turning occasionally, until browned & cooked through.
Remove fish from pan, remove pan from heat & wipe out any remaining oil.
Add a knob of butter to the pan, which will still be hot enough to melt the butter without burning it.
Once butter has melted, add as much lemon juice & rosemary as you like & stir well, then pour over the fish and serve with homemade cheesy potato wedges and petite pois.