This is the worst recipe I saw for a Filthy dirty martini.
Why the lime juice ? It doesn't make sense, it's a stirred cocktail, not a shake cocktail and basically: juice in a gin martini ? Even shake we don't put juice in a gin/vodka martini
Too much vermouth, olive brine make the martini already wet than usual, 5ml is a better option.
10ml of olive brine is not enough, 10 is usually for a classic dirty martini, 15ml is a better option, particularly if the olive brine is good quality.
Idk know why this recipe is on difford guide...