Cooking salmon in foil is a way of steaming it.How that happens is that, after seasoning your salmon, you seal it up in a foil pouch. The vegetables should be tender at this point, too! When you heat it, which you do in a very hot oven, the fish cooks by way of the steam that's released from the salmon itself as well as any vegetables, citrus and fresh herbs you might (and should) add to the pouch. Mix the sugar, butter, lemon juice, thyme, oregano, garlic, salt, rosemary, and pepper in a bowl. Put the salmon on the lined baking sheet and fold all the sides of the foil up. Bake for 20 minutes or until the fish is cooked and pulls apart easily. Fold the foil over the salmon and cover it well. Rack … The vegetables should be tender at this point, too! Fold the sides of the foil into a tight packet around the fish and asparagus. How long and what temp to bake salmon in foil? I’ve chosen to do this Honey Baked Salmon in Foil at 400F. This is the easiest question to answer, as well as the most important aspect. When you heat it, which you do in a very hot oven, the fish cooks by way of the steam that's released from the salmon itself as well as any vegetables, citrus and fresh herbs you might (and should) add to the pouch. Place the foil packets on a large rimmed baking sheet. Alternatively, you … Place the foil packets on a large rimmed baking sheet. Spread the butter mixture on salmon. How that happens is that, after seasoning your salmon, you seal it up in a foil pouch. Cook in the oven for about 20 minutes. How long to bake salmon in foil at 400 degrees F: A 4-ounce piece of salmon requires about 20 minutes to bake in foil at 400 degrees F. You know the fish is done when it flakes easily with a fork. How long to bake salmon in foil at 400 degrees F: A 4-ounce piece of salmon requires about 20 minutes to bake in foil at 400 degrees F. You know the fish is done when it flakes easily with a fork. Use a foil to line the baking sheet. Cooking salmon in foil is a way of steaming it. Keep the temp between 350-400F, as every oven heats a bit differently.