Saketini

History

The earliest reference a Saketini I've found is in Vincent Sardi Jr. & George Shea's 1988 Sardi's Bar Guide.

SAKETINI
This is a Martini made with sake instead of vermouth. A ratio of about 5:1 gin or vodka to sake seems to work best.
2½ ounces vodka or gin
½ ounce sake
1 olive, lemon twist, or cucumber slice for garnish
Combine vodka or gin and sake in a cocktail shaker with ice cubes. Shake. Strain and serve straight up in a cocktail glass, or serve on the rocks by emptying contents, ice cubes and all, into an Old-Fashioned glass. (If you'd rather not shake it, this drink may also be gently stirred in a mixing glass.) Garnish with an olive, lemon twist, or cucumber slice.)

Vincent Sardi & George Shea, Sardi's Bar Guide, 1988

The Saketini is closely associated with the Kyoto Steak House, which opened its first location in December 2009. The restaurant is also noted for its Dirty Ninja Sakatini, made with Japanese vodka, gin, and sake muddled with cucumber, nori strips, and sweetened rice wine vinegar.