Whiskey Peach Smash

1 small peach
3 mint
2 pieces lemons
1 oz water
1/2 oz simple syrup
2 oz Canadian whisky

Muddle all ingredients except whiskey in a bar glass. Add whiskey, and shake with ice. Strain into an ice-filled old-fashioned glass, garnish with a sprig of mint and a peach slice, and serve.