Difford's Guide remains free-to-use thanks to the support of the brands in blue above.
This is subtitled "simple" for good reason but, if freshly pressed juice is used, it's as good if not better than other Apple 'Martini' recipes.
Sour Apple Martini, Caramelised Apple Martini
Formula by yours truly (Simon Difford) in 2004.
Our Martini cocktail page details its evolution and other common variants.