To make simple syrup:

1. In a small saucepan, combine water and sugar. Bring to a boil and then reduce heat. Simmer 3-5 minutes, stirring constantly.
2. Remove from heat and allow to cool to room temperature.
3. Add in lemon juice and stir well.
4. Transfer to sterilized bottles. Refrigerate – keeps indefinitely.

To make cocktail:

1. Add 2 ounces lemon simple syrup, Bushmills Irish Whiskey, and three blackberries to a shaker and shake vigorously until blackberries start to break up to give that gorgeous blush color.
2. Strain into glass packed with fresh crushed ice.
3. Garnish with additional blackberries.