Preheat oven to 450F.
Take salmon out of the refrigerator, place skin side down on a foil-lined sheet pan, pat the flesh side dry with a paper towel, and season with 1/2 teaspoon salt and set aside.
Make salmon topping by mixing salmon topping ingredients (mayonnaise, grated garlic, dill, lemon zest and juice, and olive oil) in a small to medium bowl until they're thoroughly combined and set aside.
Prepare tomatoes by mixing all tomato ingredients (tomatoes, salt, garlic powder, olive oil, chopped basil) in a large bowl and tossing until thoroughly combined.
Spread salmon topping evenly over salmon fillet.
Throw the tomatoes on the pan next to the salmon. (I do roughly half per side.)
Roast for 15 minutes at 450F.
Garnish with fresh chopped basil, and that's it! Enjoy!
