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              Prepare onions and garlic. Fry the garlic and onion in butter until transparent, about 5-7 minutes, place in a saucepan.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Prepare remaining vegetables. Add celery root, carrots and potatoes to the pan with the fried onions and garlic.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Prepare the soup base. Fill the contents of the pan with hot water; the liquid should completely cover the vegetables. When the water boils, reduce the heat to low and cook the vegetables for 30 minutes.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Make the soup puree. When all the ingredients in the soup are ready, puree them using a blender. Pour the cream into the pan, add salt and pepper. Return the pan to the heat and bring to a boil.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Pour the celery puree soup into serving bowls and sprinkle with finely chopped parsley on top.