Blueberry Sour coffee cocktail

1. Fill the glass with ice.

2. Add ice to the shaker halfway.

3. Measure alcohol, Cold Brew coffee concentrate, lemon juice, and syrups into the shaker. Shake vigorously a few times.

4. Pour out the water that has dissolved from the ice in the glass or replace the ice.

5. Pour the drink through a double strainer into the glass over the ice.

6. Add blueberries as a garnish.