Cut 4 pieces of parchment paper, approximately 12 inch square (or 12 inches by the length of your roll)
Fold each piece of parchment in half and take a little olive oil and spread it where you plan to lay each piece of fish (this will prevent the fish from sticking)
Place one piece of fish per piece of parchment paper next to the fold in the center
Season with salt and pepper, then top with herbs (if using), 2 lemon slices and a pat of butter
Fold the paper over and starting from one side near the fold roll the edges of the paper in to seal the fish and form a packet, it should look like a half moon
Place the packets on a baking tray with some space between and put in the oven
Bake for 10 - 12 minutes depending on the thickness of the fish
You can serve directly by putting the packet on the plate or use a spatula to remove the fish and plate
Notes
This recipe can easily be modified by adding shallots, other fresh herbs, cherry tomatoes, capers or olives. If I have a bottle of wine open, I will sometimes add a tsp of wine to each packet. If you're looking for a healthier option you can use olive oil or coconut oil and omit the butter.