Add all the ingredients to a shaker filled with ice and shake.
Fine-strain into a chilled coupe.
Garnish with frosted blueberries and an edible flower.
*Blackberry syrup: Take 6 oz sugar, 6 oz water and 6 oz blackberries and bring to a boil. Reduce to a simmer and cook for 20 minutes. Remove from heat, strain, and add salt to taste.