In a mixing bowl toss together corn, tomatoes, 1 teaspoon kosher salt, ½ teaspoon ground black pepper and avocado oil.
Place corn mixtrure in an oven safe baking dish. Place in oven for 20 minutes.
While vegetables are in the oven, mix together tarragon remaining salt and pepper on a dish.
Using a paper towel fully dry cod fillets before pressing into tarragon mixture.
Remove corn from oven and place seasoned cod on top. If there is any tarragon mixture left, sprinkle on corn. Drizzle a small amount of avocado oil on each fillet.
Place back in oven and bake for another 10 minutes.
Serve as is or flake cod and serve in a warm corn tortilla topping the taco with the roasted tomatoes and corn.
Notes
Cooking time for cod may vary depending on the thickness of fillet.