Heat the olive oil in a small saucepan.
Add the celery, onion, and garlic and cook for several minutes, stirring occasionally, until the onion is translucent.
Transfer the onion mixture into a blender with the rest of the ingredients.
Blend for 1 minute, until smooth and creamy.
Transfer back to the sauce pan and heat until desired temperature.
Taste for seasoning and add salt if necessary.