The Book of Household Management by Mrs. Beeton

495. Procure some nice young parsley; wash it and dry it thoroughly in a

cloth; pound the leaves in a mortar till all the juice is extracted, and put the juice in a teacup or small jar; place this in a saucepan of boiling water, and warm it on the _bain marie_ principle just long enough to take off its rawness; let it drain, and it will be ready for colouring. TO PRESERVE PARSLEY THROUGH THE WINTER.