Original Receipt in 'The Cook and Housekeeper's Dictionary' by Mary Eaton (Eaton 1822);COCKLE KETCHUP. Open the cockles, scald them in their own liquor, and add a little water, if there be not enough; but it is better to have a sufficient quantity of cockles, than to dilute it with water. Strain the liquor through a cloth, and season it with savoury spices. If for brown sauce, add port, anchovies, and garlic: a bit of burnt sugar will heighten the colouring. If for white sauce, omit these, and put in a glass of sherry, some lemon juice and peel, mace, nutmeg, and white pepper.