Relatively under the radar in the United States, the Caesar may as well be the national drink of Canada. Invented on May 13, 1969 in Calgary, Alberta, it swept the country, now a fixture of bars and restaurants from coast to coast. (A 2009 push by Calgary's mayor to officially make it Canada's official drink didn't, alas, result in success.) And so it was that my first Caesar was handed to me by, yes, a Canadian - the morning after an all-night euchre tournament, no less. In a cruel trick (that was, in retrospect, a necessary one), no one would tell me the Caesar's secret ingredient until I downed the whole pint. No problem — and once I got over the initial shock of drinking chilled shellfish liquor, the drink made perfect sense. Lighter and less sweet than pure tomato juice, Clamato is a surprisingly balanced foil for icy vodka, a briny counterpoint similar to the olive juice in a dirty martini, or the salty garlic of a whiskey pickle back.