Gut fish and remove head. Thinly slice the lemon, orange and lime. Lightly rub the cavity of the fish with salt. Place fruit slices in cavity with a couple of dabs of butter. Lightly oil the outside of the fish and wrap in tin foil making sure of a good seal. Cook on each side for about 10 mins. Fish will flake off the bones.
"Sour Salt" a common Kosher cooking aid, is citric acid in a solid form. It is an extremely good substitute for vinegar or lemon juice in backpacking recipies.
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