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              Place the onions and carrots in a preheated frying pan with vegetable oil.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Fry the onions and carrots until tender for 2-3 minutes, add salt and pepper to taste.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Cut the pre-peeled potatoes into slices. Place it in a baking dish coated with oil.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Place a layer of chopped fish on top of the potatoes.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Place fried onions and carrots on the fish, brush them with mayonnaise or sour cream.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Preheat the oven to 180 degrees. Place the pan in the oven. Remove the potato casserole after 50 minutes.
              
              
 
              
      
     
              
              
               
              
                  
                   
                   
               
              Serve the casserole hot. Don't forget to sprinkle it with herbs.