What is the required action to prepare the Shaken Espresso after adding ingredients?

To prepare the Shaken Espresso correctly after adding ingredients, it is essential to shake well. This action is crucial as shaking ensures that all the ingredients are thoroughly combined, resulting in a uniform flavor and texture. Shaking also helps to chill the drink and create a frothy layer on top, which is characteristic of a well-made Shaken Espresso.

Other methods of combining the ingredients, such as blending or stirring, do not achieve the same level of incorporation and texture that shaking provides. Pouring immediately without shaking would result in a drink that lacks the desirable froth and integration of flavors, which is not the intended outcome of the recipe.