Oyster Sauce for Fish.
Blanch the oysters, strain them, and preserve their liquor; then wash and beard them, drain, and put them into a stewpan; then add fresh butter and the oyster liquor free from sediment, some flour and water to thicken it, season to the palate with lemon juice, anchovie liquor, a little cayenne pepper, a spoonful of ketchup if approved, and a bit of lemon peel. When it boils skim it, and let it simmer five minutes.
N. B. Muscles and cockles may be done in like manner.
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