Sauté the finely chopped onion in a pot. Add sliced carrots and diced potatoes and simmer for a while. Pour broth in and cook until half way done. Then add the diced salmon and cook until the fish is cooked (about 10 minutes).
Set aside some boiled potatoes, carrots, fish and fresh dill to garnish the soup. Add chopped dill to the soup. Mix the soup with a hand mixer into a smooth cream.
Add heavy cream and cook for a while.
Season with salt and pepper. Garnish the soup on a plate with pieces of salmon, carrots, potatoes and dill.