From the "king of Cocktails" Dale deGroff, this can be made with any relatively light whiskey. Simple syrup is simply equal amounts of water and sugar, heated till the sugar is totally dissolved. Muddling is mashing ingredients in the bottom of the glass, using the back of a spoon or something similar.
Muddle all ingredients except whiskey in a bar glass.
Add whiskey and shake with ice.
Strain into an ice-filled rocks glass and garnish with a sprig of mint and a peach slice.
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