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The Winchester
30 ml Haymen’s Old Tom gin
30 ml Martin Miller’s Westbourne Strength gin
35 ml Tanqueray dry gin
20 ml lime juice
20 ml grapefruit juice
20 ml St. Germain
12.5 ml grenadine
7 ml ginger syrup
1 healthy dash Angostura bitters
Shake with ice and strain in to a crushed-ice filled Tiki mug.