|  | 1 ½ cups onion, finely chopped | 
                      
                      
                      
                        
                          |  | 3 lb 5 oz (1 ½ k) white potato, peeled, cut into ¼ in (1/2 cm) cubes, (do not rinse potatoes) | 
                      
                      
                      
                        
                          |  | 1 ½ cups chicken broth, approximately (use more if needed) | 
                      
                      
                      
                        
                          |  | ¾ - 1 cup grated parmesan cheese, approximately | 
                      
                      
                      
                        
                          |  | ¾ cup green onion, green part, finely chopped | 
                      
                      
                      
                        
                          |  | 2 fresh yellow ají, (chili) seeded and deveined, finely chopped (optional) |