Final answer:
The correct practice for shaking a Margarita is to do it vigorously for about 10 to 20 seconds, which is typically more than the 10 shakes option D, but it is the closest to the recommended practice among provided options.
Step-by-step explanation:
The question on how many times a Margarita should be shaken at the table relates to the art of mixology, which is part of the culinary arts. The ideal number of shakes for a Margarita or any similar cocktail is not a precise science but is often suggested to be between 10 to 15 shakes.
Properly shaking a Margarita incorporates a balance between chilling the drink and slightly diluting it with melted ice to achieve the desired flavor and temperature. The shaking should be vigorous and should last about 10 to 20 seconds. This is generally sufficient to chill the drink thoroughly without excessively diluting the flavors.
None of the multiple-choice options provided (3, 5, 7, or 10 times) accurately depict the recommended practice for mixing a Margarita. It's important to pay attention to the sound and feel of the ice, which changes as the shaking chills the drink.
Hence, among the given options, D. 10 times is likely the best answer, but in professional practice, shaking is measured more by seconds than by the number of shakes.