What element is essential for making the Frozen Strawberry Margarita?

The essential element for making a Frozen Strawberry Margarita is strawberry puree. This ingredient is crucial because it provides the primary flavor and main ingredient that defines the margarita as a "strawberry" variant. The combination of fresh strawberries or strawberry puree blended with ice not only contributes to the drink’s taste but also impacts its texture, giving it a refreshing and fruity profile.

While other ingredients like cranberry juice, Peachtree schnapps, and peach puree can be used in various cocktails or might augment flavors, they do not serve as the foundational flavor component of a Frozen Strawberry Margarita. Using strawberry puree ensures that the classic taste is maintained, which is why it is the key element in this drink.