Authentic guacamole is made in a molcajete (volcanic basalt mortar): onion, serrano chili, and salt are ground to a paste first, which seasons the stone and builds the aromatic base before the avocado is added and roughly mashed — not smooth, not chunky, but somewhere in the middle where texture is still present. The word comes from the Nahuatl 'ahuacamolli': ahuacatl (avocado) + molli (sauce). Aztec records document avocado sauce being consumed before Spanish contact, making guacamole one of the few dishes in North American cuisine with a direct pre-Columbian lineage. Ripe Hass avocados — black-skinned, with creamy, nutty flesh — are the only correct variety; the larger, bright-green Florida avocado has higher water content and less fat, which produces a loose, flavorless result. Lime juice is essential not just for flavor but to slow oxidation.
Cut the avocados in half, remove the pit, and scoop the flesh into a mixing bowl.
Using a fork, mash the avocados to your desired consistency. Some prefer it chunky, while others like it smooth.
Add the lime juice and salt to the mashed avocados.
Stir in the diced onion, chopped cilantro, diced tomatoes, and minced garlic.
If you like a bit of heat, add a pinch of ground cayenne pepper to the mixture.
Mix all the ingredients together until well combined.
Hand-mashed Hass avocado with lime, cilantro, white onion, serrano; pre-Columbian Aztec origin.
Mexico; Aztec recipe documented before Spanish contact; 'ahuacamolli' in Nahuatl.
Ripe Hass avocados, fresh lime juice, white onion (finely diced), serrano or jalapeño, cilantro, salt.
Make it immediately before serving — avocado oxidizes quickly; press plastic wrap directly onto the surface (not just over the bowl) if storing briefly.
Totopos (tortilla chips), tacos, tostadas; as a condiment with any Mexican meal or grilled protein.