Heat your galley oven to 350º or a bit hotter. Slice up the leeks into disks. Mince the garlic. Sauté in large pan in the EVOO until leeks start to become translucent. Chop the plum tomatoes.
Add the tomatoes and let them cook down, about 10 minutes. Add the wine, Herbs of Provence, salt, pepper, sugar and capers. Let cook for another 5 minutes. Adjust seasonings as needed.
Sprinkle the fish filets with salt and pepper. Pour the tomato sauce into a baking pan. Nestle the fish filets into the sauce and give another little sprinkle of Herbs of Provence. Pop into your preheated oven for 15-20 minutes or until fish turns opaque and can flake with a fork.
Sprinkle with minced parsley and tarragon before serving. Serve and rice, pasta or just a baguette to soak up the sauce. Presto!