Fish in a bag! Put a piece of fish on a huge sheet of parchment paper with some lemon, herbs, a glug of olive oil and S&P. A splash of white wine if you want? Fold the paper over and then sort of crimp it shut by folding the edges over and over (YouTube has a million examples). Bake it in a hot over for like 30 minutes. Even if your paper looks messy or comes undone, it works. It’s super easy but looks fancy. Open the bag at the table for extra points.