The san salvador is a delicious, simple rum sour recipe we found in the pages of dale degroffs classic tome, the craft of the cocktail. Degroffs recipes are often a mite too sweet for the modern palate, so we eyed the orange curaao measure with suspicion; degroffs recipes typically call for sweeter brands like grand marnier. We neednt have worried The san salvador is a rich, flavorful, well-balanced, and decidedly rum-forward drink, even when made with grand marnier and its still quite lovely with a drier curaao, too.