The Book of Household Management by Mrs. Beeton

501. INGREDIENTS.--1 teaspoonful of mushroom ketchup, 1 teaspoonful of

cavice, 1 teaspoonful of Chili vinegar, 1 teaspoonful of Reading sauce, a piece of butter the size of an egg, 3 tablespoonfuls of thick Béchamel, No. 367, 1 tablespoonful of minced parsley, 3 tablespoonfuls of cream; salt and pepper to taste. _Mode_.--Scald the parsley, mince the leaves very fine, and add it to all the other ingredients; after mixing the whole together thoroughly, the sauce will be ready for use. _Average cost_, for this quantity, 10d. _Seasonable_ at any time. READING SAUCE.