What You'll Need:
First preheat that oven!! 450 degrees should do it.
Then put your foil into a glass baking sheet and place the lemons on the foil.
Next, put your thawed salmon in a bowl and lightly coat with olive oil and seasonings.
Put pats of butter (the thinner the pat the thinner your waist) and top with more seasoning.
Bundle it all up and bake for 15 mins.
Remove it from the oven and open the foil a bit, then bake again for 10-15 more minutes.
For medium rare it should still be quite purple.
I like to pour the lemon from the foil over the fish because ahi is a little drier than most fish.