Cut and mince the skins of 3 lemons and 2 grapefruit. Gently simmer for 2 or 3 hours, let cool and strain out the clumps. Pour into a ice cube tray and you have premeasured cubes. Put one in a tall glass of boiling water, add honey to taste, 4 tbsp. rum if you wish. This makes a curative good for ridding you of colds. For legal reasons, I won't tell you what similar meds this concoction is like but it was popular in "Africa" Hint hint.