Lohikeitto (Finnish salmon soup)

Name: Lohikeitto (Finnish salmon soup)
Cook time: 1 h 15 min
Total time: 1 h 15 min
Cuisine: European
Ingredients: 3 allspice berries; 350g potatoes peeled and chopped into 1cm cubes; 2 (about 225g) salmon fillets skinned and cut into 1cm cubes; 1 tbsp butter; 60ml single cream; chopped to make 2 tsp dill; salmon skin from the salmon fillets; 3 black peppercorns; 1 small carrot peeled and chopped; 2 shallots peeled and chopped; 1 bay leaf; 10 stalks flat-leaf parsley; ½ small leek; 1 stick celery cut in three