Which of the following is NOT an ingredient of guacamole?

Guacamole is traditionally made using mashed avocados as the base ingredient, along with several other components to enhance its flavor. While jalapenos, red onions, and citrus juice (commonly lime juice) are frequently included in authentic recipes, tomatoes are not essential for making guacamole.

Tomatoes can be added for extra flavor and texture, but they are not considered a core ingredient. In many traditional versions, particularly in regions of Mexico, guacamole is prepared without tomatoes to preserve the taste of the avocados and highlight the other ingredients. Thus, identifying tomatoes as an optional rather than a necessary ingredient makes it clear why this choice stands out from the others listed.