Sugar, to clarify.
Break into pieces two pounds of double-refined sugar; put it into a stewpan, with a pint of cold spring water; when dissolved, set it over a moderate fire; beat about half the white of an egg; put it to the sugar, before it gets warm, and stir it well together. When it boils, take off the scum; keep it boiling till no scum rises and it is perfectly clear. Run it through a clean napkin; put it in a bottle well corked, and it will keep for months.