Stirring milk or cream into a pot on the stove tends to happen at the tail end of the cooking process to prevent curdling, however, if you're making potato soup in a slow cooker, evaporated milk is ...
Add the milk and purée the soup in a blender or food processor. Taste and adjust seasoning. Serve sprinkled with a few freshly chopped herbs or some of the following garnishes.
Cool the soup slightly, then liquidise with the coconut milk and process until smooth. Season with salt and pepper. Heat through without allowing the soup to boil, and add the lime juice.