First cut the avocado in half lengthwise, remove the pit and skin, and chop the avocado into pieces.
Add the garlic and cilantro in the bowl of a food processor.
Add in the sour cream, mayonnaise and lime juice.
Finally add the chopped ripe avocado.
Pulse the mixture and process until smooth and well mixed, stopping to scrape down the sides and mix more. Process until it is the desired consistency, for thinner consistency just add a little bit of lime juice.
Store in an airtight container in the refrigerator.