What can be defined as a regular portion of mayo?

A regular portion of mayo can best be defined as a heaping scoop of mayo because this term indicates a standard serving size that is generous, ensuring enough flavor and moisture without overwhelming the other ingredients. In food preparation, specifically in sandwich making, a heaping scoop suggests a portion that balances well in the context of the overall dish, allowing for the intended taste and consistency.

The other options suggest varying degrees of portion sizes. A level scoop typically means a standardized amount, which may not provide the desired flavor profile in a sandwich. An overflowing scoop implies excess that can create a messy eating experience and overpower the other flavors. A teaspoon, on the other hand, is much too small to be considered a regular portion for mayo, as it would not adequately enhance the taste of a sandwich. Thus, the choice of a heaping scoop aligns with expectations for a balanced and flavorful serving.