POTATO CHEESE

6 oz. of mashed potatoes, 2 lemons, 6 oz. of sugar, 2 oz. of butter. Grate the rind of the lemons and pound it well with the sugar in a mortar, add the potatoes very finely mashed; oil the butter and mix this and the lemon juice with the rest of the ingredients; when all is very thoroughly mixed, fill the mixture in a jar and keep closely covered.