
Preheat the oven to 375 degrees F. Cut 4 large squares of heavy aluminum foil large enough to hold 1 flounder fillet and one-quarter of the vegetables. Lightly butter 1 side of each and set on a work surface.
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Lay the fish flat in a baking dish. In a bowl, whisk together the sake, soy sauce, lime juice, ginger, sesame oil, honey, and sesame seeds. Pour over the fish and let marinate for up to 30 minutes. Arrange 1 fish fillet on each sheet of aluminum foil and top with one-quarter of the mushrooms, onions, carrots, peppers, and marinade. Wrap tightly and place on a baking sheet. Bake until the fish is cooked through and the vegetables are tender, 15 to 20 minutes.
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Remove from the oven and unwrap each package. Transfer the fish and vegetables to 4 large plates and top with the cooking juices. Serve with Sauteed Shiitakes and hot steamed rice.
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Yield: 4 servings