
This foil-baked salmon is a simple, flavorful dinner that comes together with just a handful of ingredients. Butter, onion, and mushrooms keep the fish moist and tender, while a splash of ponzu at the end adds a bright, savory finish.
Preheat the oven to 400°F (200°C). Lightly season the salmon fillets on both sides with salt and pepper. Slice the onion into thin wedges and trim the shimeji mushrooms, separating them into small clusters.

Lay out 3 sheets of aluminum foil. Place 1 teaspoon of butter in the center of each sheet, then divide the onion evenly over the butter. Lightly season the onion with a little more salt and pepper.

Set one salmon fillet on top of each bed of onion. If you like, sprinkle the salmon lightly with garlic seasoning for extra flavor.

Top each fillet with an even amount of shimeji mushrooms.

Fold the foil over the salmon and seal the packets well. Place them on a baking tray and bake for 15 to 20 minutes, or until the salmon flakes easily with a fork.

Carefully open the foil packets to avoid hot steam. Serve the salmon hot and drizzle with ponzu to taste. Finish with black pepper or your favorite seasoning, if desired.

If shimeji mushrooms are unavailable, use sliced button mushrooms, shiitake, or oyster mushrooms. Do not overbake the salmon or it may dry out; start checking at 15 minutes. Leftovers can be refrigerated in an airtight container for up to 2 days.