1. Preheat the oven to 400F. Lay the foil pieces on a counter and place a fillet in the middle of each one. Scatter the asparagus, mushrooms, and ginger on top of the fish.
2. Drizzle each fillet with soy sauce and mirin and season with a small pinch of salt and black pepper.
3. Fold the foil over the ingredients and crimp the edges to seal. Place the packets on a large baking sheet and bake 20 to 25 minutes, depending on the thickness of the fillets.
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