Take a small bowl, add diced onion and add half a cup of warm water to it.
After 5 minutes, drain the water. This de-flames the onions, making them less intense.
Cut avocados in half lengthwise and remove the pit. Scoop out the flesh and add to a bowl and add lime juice to the avocados.
Now using fork, mash the avocados until creamy, but still a little chunky.
Stir in the tomatoes, coriander leaves, drained de-flamed onions, salt, and green chilies.
Taste the guacamole and adjust with additional salt or lime juice.
Serve immediately or cover with plastic wrap by pushing the plastic wrap down onto the guacamole and refrigerate for up to one day.