Foil-Packet Salmon with Mushrooms and Spinach

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2 cups thinly sliced shiitake mushroom caps

4 cups baby spinach

Kosher salt and freshly ground pepper

4 6-ounce skinless salmon fillets

Extra-virgin olive oil, for drizzling

1/4 cup dry white wine (or use water)

4 tablespoons unsalted butter, at room temperature

3 scallions, sliced

2 teaspoons grated fresh ginger

1/2 teaspoon toasted sesame oil