Method: Lightly muddle the lime juice, sugar and mint in a jug or cocktail shaker. Add ice to a highball glass and pour over the concoction. Next add the rum and then top with soda and stir.

Mrs. Biddle`s Key Lime Juice also is available by mail order from the Florida Keys. At Mrs. Schepp`s Candy Store (528 Front St., Key West, Fla. 33040; 305-294-3120), a 16-ounce bottle is $2.49 ...

In addition, the 30 milliliters of juice per 2 liters of water amounts to about one-half Persian lime per bottle, a quantity that will likely not be prohibitively expensive or create an unpleasant ...