I have been repeatedly disappointed in approaching a bar, ordering a Turf Club, and having to explain how to make one. This is a wonderful and classic recipe, people! It's basically the missing link between the Manhattan and the Martini, held together with orange bitters; subtle and potent and complex, all in one. Should I ever own a bar, this will be on my "Classics" list.
2 1/2 oz gin (you want something round and slightly sweet here; Damrak, Old Tom, and Plymouth all work well)
1 oz sweet vermouth
4-5 dashes orange bitters
Stir well with ice and strain into a chilled cocktail glass; garnish with an orange or lemon twist, depending on your gin.
I especially like this with Old Tom, as it's an old-school recipe and the stuff is most certainly authentic. It will make your drink sweeter, so depending on your preference you may like to increase the bitters or reduce the vermouth. Alternately, you could use a dash of simple syrup with Damrak or Plymouth. I don't recommend a London dry here, nor anything as light as New Amsterdam or Bombay Sapphire.