The traditional British cocktail to serve at your next garden party or royal wedding do

The first time I had Pimm’s Cup, I was in the Costwolds, visiting friends of friends, and I was baffled. Why, I wondered, were these nice strangers handing me what appeared to be a glass filled with fruit salad and cola?
Little did I know that Pimm’s is a grand British tradition like double decker buses, cream teas and cricket whites. And as Prince Harry and Meghan Markle head to the altar on May 19 for the first of this year’s two royal weddings (the other is Princess Eugenie’s nuptials on Oct. 12), it seemed like a good time to revisit this classic English cocktail.