Remove the salmon from the fridge about 20 minutes before cooking to bring it closer to room temperature.
Grease a sheet pan. Optionally, line your baking sheet with parchment paper or aluminum foil for easy clean up.
Place salmon on pan, skin side down.
Set oven to broil (high) and adjust the top rack to about 6 inches below the top heating elements.
In a small bowl, make the panko herb mixture. Mix breadcrumbs, melted butter, garlic, oregano, marjoram, rosemary and dill weed and garlic powder together for the herb crust. Fluff with a fork until crumbs are lightly moistened.
Place salmon in oven and broil on top rack for 6 minutes.
Remove salmon from oven and generously slather herb topping on salmon fillets.
Return to oven for another 2 minutes, or until salmon flakes easily and is cooked through. Be careful to watch the herb topping as it burns easily when overcooked.
For the relish:
To a small bowl, combine tomatoes, onions, red wine vinegar, olive oil, oregano, and salt and pepper. Toss well. Sprinkle with salt and pepper to taste.
Top salmon with 1-2 tablespoon of relish and chopped herbs (optional). Serve warm.
Notes
You can substitute lemon juice or balsamic vinegar for the red wine vinegarFeel free to add parmesan cheese to the crust.Smaller filets will need less time under the broiler. For super thin filets, I've needed as little as 4-5 minutes total broiling time.