Instructions: Cut four sheets of heavy-duty aluminum foil into rectangles about 12 inches by 16 inches. Lightly oil shiny side of foil and place a fillet, skin side down, in center of each piece of foil. Top each fillet with 1 tablespoon minced ginger, 1/4 of the lime slices, 1/4 of minced green onion and 1 tablespoon mirin. Fold edges of foil on three sides to make a package, tightly double-folding each seam into what is called a drugstore lock to seal in steam and juices.

Place foil packages on cookie sheet and bake about 10 minutes for every inch of fillet thickness. Packages should puff up with steam. Remove from oven and carefully open one package to check fish for doneness. If needed, reseal and return to oven for a few minutes more. To serve, place one package on each diners plate, warning them to watch for steam as they open the packets.

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