Recipe note: The packets can be assembled several hours before cooking. Refrigerate until ready to bake, and add 4 minutes to the roasting time.
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- 2 tablespoons unsalted butter or extra-virgin olive oil, plus more for the packets
- 5 ounces baby spinach
- Kosher salt
- Freshly ground black pepper
- Four (6-ounce) cod, haddock or flounder fillets
- 2 tablespoons finely minced shallots
- 2 tablespoons chopped fresh dill, parsley or chives
- 1 pint cherry or grape tomatoes, halved (about 2 cups)
- 1/4 cup dry white wine or dry vermouth
Preheat the oven to 400 degrees with racks in the lower and upper thirds. Cut four 24-inch-long sheets of parchment paper. Fold each sheet in half, forming a 12-by-15-inch rectangle and, with a pencil, draw a half-heart shape on the paper, centering the heart on the folded edge and making the heart as large as you can. Using scissors, cut out the hearts. (The heart shape makes sealing easier.)
Open the heart shapes flat on your counter and lightly butter or oil the center of one side of each. Place a quarter of the spinach close to the crease on the buttered side of each piece of parchment paper. Season lightly with salt and pepper. Divide the fish fillets among the packets, placing them directly on the spinach. (If the fillets are less than 1 inch thick, fold or tuck them into compact bundles that are about 1 inch thick.) Season the fish with salt and pepper and top each with shallots, herbs and tomatoes. If using butter, cut it into smaller pats and place on top of the fillets. If using oil, drizzle a little over each fillet. Splash the wine over the top.
Fold the other half of the paper over to cover the fish. Then, starting at the top of the heart shape, working with about 2 inches of the edge at a time, fold over about 1/2 inch, pressing down and rubbing your thumb across the fold to make a crisp crease. Move a little way along the edge and fold over a couple more inches, so that your folds are overlapping and double-folded. Continue working your way around the edge of the packet, making overlapping folds, like pleats, always pressing firmly and creasing so that the folds hold. Don’t expect the folded edge to be perfectly even; it will be somewhat crooked — this is part of its charm. Go back around, making a second fold at any place that doesn’t appear tightly sealed. If there’s a slight “tail” when you reach the end, give it a twist to seal. (If you don’t quite master the seal, you can make a quick cheat by stapling or paper-clipping the edges in place.)
Arrange the packets on two large rimmed baking sheets so that they don’t touch. Bake for 14 minutes. (If the fish packets have been in the refrigerator, increase the time to 18 minutes.)
Either place the packets directly on dinner plates and provide scissors so that your guests can snip open their own packets at the table, or carefully cut open the packets in the kitchen, slide the contents out onto dinner plates or pasta bowls, and serve right away.
Calories: 220; Total Fat: 8 g; Saturated Fat: 1 g; Cholesterol: 80 mg; Sodium: 610 mg; Carbohydrates: 8 g; Dietary Fiber: 3 g; Sugars: 2 g; Protein: 28 g.