Mix ingredients together and stir; refrigerate at least one hour.
Fill chilled glasses with ice to slightly above the rim; pour mixture into ice filled glasses.
Garnish with a slice of lemon and a fresh blackberry.
Notes
Ever read a recipe that calls for simple syrup and wish you had known earlier; making it and chilling it to use in a cocktail can stop some from bothering at all. So try my quick fix. Mix one cup of sugar with 1/2 cup of water in a small saucepan. Heat on medium heat until sugar dissolves. Pour the mixture into a heat safe measuring cup and add a cup of ice (unless you're using crushed ice, then only add 1/2 cup). Stir until ice has melted and use right away!