Blueberries are small, sweet blue fruits that grow on bushes. They can be a medium dusty blue, violet, or deep black-blue. When muddled for cocktails, they create a brilliant red-violet shade, but the flavor can be delicate and easy to overwhelm with other ingredients.
What passes for a blueberry comes down to regional preferences – highbush blueberries, huckleberries, and bilberries are all members of the same family, and equally acceptable to use in drinks.
