This soup is a fast one. If you so happen to have cooked quinoa on hand, this will take you less than 10 minutes and still be bright and flavorful. This soup actually tastes best the same day, but if you are making it ahead of time, it's best to add the eggs and lemon at the last minute for optimal flavor and texture. You can still reheat the soup--you just want to do it slowly (on low heat) to prevent the eggs from curdling.