Preheat oven to 400°F (200°C). Cut 4 sheets of parchment paper, each about 12 inches long. Lay each sheet flat on a baking sheet.
In a small bowl, combine the ¼ cup olive oil, zest and juice from 1 lemon4 garlic cloves, 1 tablespoon capers, ¼ cup Castelvetrano olives, 1 teaspoon sea salt and 1 teaspoon dried parsley.4
Place one fillet of 4 6-8 oz white fish fillets in the center of each parchment paper. Add about 2 tablespoons of the olive oil mixture directly over the fish.
Arrange the 1 cup grape tomatoes and sliced 1 red onion, small. Season with salt and black pepper to taste. Top with 2 slices of 1 lemon on each fish fillet followed by 4 fresh dill sprigs.
Fold the sides of the parchment paper over the fish and veggies, then fold up the ends to form tightly sealed packets. Make sure the packets are well-closed to trap all the steam inside while cooking.
Place the parchment packets on a baking sheet and bake in the preheated oven for 15-20 minutes, depending on the thickness of the fish. The fish should be cooked through and flake easily with a fork.
Notes
Nutrition Information includes rockfish as the white fish fillets. Macros may vary. Storage: Store any leftover fish en papillote in an airtight container in the refrigerator for up to 2 days. Remove the parchment paper as it will get soggy but keep the liquid and all veggies. To reheat, place the fish and all the juices and vegetables in a covered skillet over low heat. Steam for 3-5 minutes until heated. Helpful Tips:
Cut vegetables evenly. Thin, uniform slices ensures the veggies cook at the same rate as the fish. Choose quick-cooking vegetables.
Start with dry fish. Pat the fish fillets dry with paper towel to remove excess moisture as that will dilute the overall flavor.
Seal the parchment well. Leave enough space around the fish for steam to circulate and cook everything evenly. Use tight, overlapping folds so the packet stays closed. This helps trap the steam and infuses the fish with flavor.
Don't overcook. The fish should flake easily with a fork and appear opaque. If unsure, use a thermometer and bake until the internal temperature of the fish reaches 145°F. But I personally like to pull it out a little earlier rather than risk overcooking it. It will continue to steam in the packet even once removed from oven.
Troubleshooting: Parchment paper won't stay sealed? Make sure to fold the edges tightly and multiple times to really seal it. Sometimes tying it with kitchen twine will help secure it too.Packet is leaking? If you notice liquid seeping out, it may be because the parchment paper wasn't sealed tightly enough. Double-check that all edges are pressed together and if needed, wrap the packet in an additional layer of parchment.
The information shown above is an estimate provided for your convenience by an online calculator. It should not be considered as a substitute for a professional nutritionist's advice. Please see our complete Nutritional Information Disclaimer.