1Preheat oven to 350 degrees F (175 degrees C). Put two large squares of aluminum foil onto a large, flat work surface.
2Make a bed of lemon slices in the center of each foil square; top with red onion. Lay a salmon fillet atop each pile of lemon slices and onion; season with basil, dill, and sea salt. Fold edges of the aluminum foil over the salmon and seal completely.
3Bake in the preheated oven until the fish flakes easily with a fork, about 25 minutes.
4Remove salmon from foil pouch, place on plate, and drizzle juices from foil pouch over the fish.
Footnotes
Cook's Note:
Do not poke holes in foil pouch, even when checking salmon for doneness.
Editor's Note:
The nutrition data for this recipe includes the full amount of the onion and lemon slices, though the actual amount consumed will vary.