Final answer:
The drink described with Henry McKenna Whiskey, Elderflower, Lemon Juice, and Blackberry is a unique take on a whiskey sour, previously called the "Barry Manilow". It is served in a rocks glass and garnished with a lemon wedge, showcasing a twist on the classic with additional flavors from elderflower and blackberry.
Step-by-step explanation:
The details provided describe a drink that includes Henry McKenna Whiskey, Elderflower, Lemon Juice, and Blackberry. It appears that this cocktail, formerly known as the "Barry Manilow," is a customized version of a whiskey sour, with additional flavors from elderflower and blackberry, making it unique. The name had to be changed following a request from Barry Manilow's representatives. It's typically served in a rocks glass and garnished with a lemon wedge, which is a presentation often used for cocktails that are enjoyed over ice with a single, big cube or several smaller ones to keep the drink cold without diluting it too quickly.
The whiskey sour cocktail recipe usually involves whiskey, lemon juice, and a sweetener, and is garnished with a slice of lemon or a cherry. The addition of elderflower and blackberry to the drink provides a floral, fruity twist, enhancing the cocktail's complexity and depth of flavor.