One of the six basic drinks in David Embury's Fine Art of Mixing Drinks. I always see it as a guaranteed bridge between classic and modern cocktails like the Cosmopolitan, Lemon Drop, and other basic sours. Use Applejack if you prefer a milder profile or Calvados or Laird's Bonded Apple Brandy if you're looking for a richer, more apple-y cocktail. Finding the sweet/sour balance is a personal preference. And always use real grenadine, not the stuff that's bright pink from your dusty liquor cabinet.