Caper Sauce.
Take out a cupful of the liquor in which the mutton was boiled (putting away the rest for soup), strain, heat, and skim; stir in two tablespoonfuls of butter rubbed in a teaspoonful of flour; pepper, boil up, pour upon a beaten egg; return to the fire and stir for a minute; add two dozen capers or nasturtium-seed, and pour into a sauce-boat. Pass, of course, with the mutton.