If you have never tried baking fish in foil, let me tell you: you need to try it. Like, tonight.
Because it's both the easiest thing ever (I promise), and the coolest-looking thing ever; it's guaranteed to have whoever you serve it to all "ooh, ahh, how did you do that?!" And your answer will be: "With hours of intense labor." Except that will be a lie, because the total amount of effort that you will have put into this fancy-looking dinner will be approximately what is required to assemble a bowl of instant oatmeal.
I usually make salmon this way, but halibut is another nice, light, summery fish that goes well with things like white wine and lemon, so I thought I'd give it a shot. And: delicious. Nice, light and summery, as expected.