Take the fish out of the fridge for as long as 1 hr before cooking (if you have the time). Preheat oven to 300˚F.
Soak your raisins or currants while you are getting everything else ready.
Make your Herb Mixture by chopping and mixing everything together.
Rub the herb mixture all over the fish.
Preheat a cast iron or large fry pan over medium-high heat for at least 10 minutes.
Put the oil in the pan, when the oil is shimmering, add the seasoned fish, flesh side down and the tomatoes and cook for 3 minutes. Flip the fish, toss the tomatoes around a little and place the pan in the oven for 10 minutes.