Bring a medium pot of water to boil and place the peaches in the water for roughly 2-3 minutes. Afterwards, immediately drop them into a bowl of ice water. This will help the peach skin come off with ease.
Peel the peaches and slice.
In a food processor, puree the peaches until smooth and they reach a pour-able consistency. Pour into an ice cube tray, filling each mold about halfway. Let freeze for at least 5 hours before using.
In a pint glass or cocktail mixing glass, muddle mint leaves and simple syrup
Fill glass halfway with ice and pour Jameson in glass. Stir with a barspoon until thoroughly mixed. You can also use a Boston shaker and shake for approximately 30 seconds.
Fill your rocks glasses with crushed ice and strain cocktail over ice.
Top off with a frozen peach cube and garnish with mint leaves.
Notes
Make sure the peach ice cube has had adequate time to freeze - at least 5 hours.
Keyword Irish Whiskey cocktail, Peach and Whiskey drink, peach cocktail