Make the marinade: Mince the garlic and grate the ginger. In a small bowl, whisk together the garlic, ginger, sesame oil, juice of half of the lemon, coconut aminos, salt, and pepper.
Prepare the Foil Packets
Slice the mushrooms and green onions and set them aside. Slice the other half of the lemon into rounds.
Lay out four large sheets of tin foil. Divide the snow peas and sliced mushrooms between them, laying a small pile of veggies in the center of each piece of tin foil. Place one fillet of fish on each and lay a slice of lemon on top of it. Pull the sides of the foil up a bit, and gently press only two of the the ends together.
Pour the marinade mixture onto each fish, coating the top & bottom. Close the foil, sealing it on the top and sides fully, and let it marinate for about an hour.
Preheat oven to 375℉. Place the fish packets on a rimmed sheet pan and bake for about 18-20 minutes, depending on the thickness of your fish. Open the foil and use a fork to check for doneness (the fish should flake easily). Garnish with sesame seeds, sliced green onions, and lemon slices, if desired. Serve while fish is warm.
Video
Notes
You can assemble and marinate the packets up to a day in advance and store them in the fridge until ready to bake.
If using frozen salmon, make sure it’s fully thawed before assembling the packets so the fish cooks evenly.
Store leftovers in an airtight container for up to 4 days. Reheat gently in the oven or microwave to avoid drying it out.