Salmon soup relies on fresh salmon, root vegetables, dairy cream, and aromatic herbs as its main ingredients. The traditional Nordic dish, known as lohikeitto, combines these elements to create a rich, comforting soup with a distinctive creamy texture and delicate fish flavour that has warmed households for generations.
What are the essential base ingredients for traditional salmon soup?
Traditional salmon soup requires fresh salmon fillets, potatoes, carrots, leeks, double cream, and fish stock as its foundation. These core ingredients create the authentic flavour profile and creamy consistency that define proper lohikeitto. The salmon provides protein and rich taste, while root vegetables add substance and natural sweetness.
The dairy component, typically double cream or whole milk, transforms the clear fish stock into the characteristic pale orange, velvety soup that salmon soup enthusiasts recognise. Some recipes incorporate a small amount of butter for additional richness and to help develop the vegetables’ flavours during the initial cooking stage.
Fish stock serves as the liquid base, though many home cooks successfully use vegetable stock or even water when fish stock isn’t available. The key lies in allowing the salmon bones and skin to simmer briefly in whichever liquid you choose, creating a natural fish essence that enhances the overall depth of flavour.
Which vegetables work best in salmon soup and why?
Potatoes, carrots, and leeks form the traditional vegetable trio for salmon soup, each contributing unique textures and flavours. Potatoes provide heartiness and help thicken the soup naturally, while carrots add sweetness and vibrant colour. Leeks offer a mild onion flavour without overwhelming the delicate salmon.
Waxy potatoes work better than floury varieties because they hold their shape during cooking and don’t break apart into the soup. Cut them into uniform chunks to ensure even cooking. Carrots should be sliced into rounds or half-moons, maintaining some bite to provide textural contrast against the tender fish.
Seasonal variations might include fennel for a subtle aniseed note, celery for additional aromatics, or even small amounts of swede for earthiness. However, the vegetable selection should never compete with the salmon’s delicate flavour. Each addition should complement rather than mask the fish’s natural taste.
Fresh dill stands apart from other vegetables as an essential aromatic component, added at the end of cooking to preserve its bright, fresh flavour that pairs perfectly with salmon.
How do you choose the right salmon for making soup?
Fresh salmon fillets with skin work best for soup, though frozen salmon can be acceptable if properly thawed. Choose middle-cut fillets rather than tail pieces, as they provide a more consistent texture and better flavour. The skin adds richness to the stock and can be removed before serving if preferred.
Atlantic salmon offers reliable results due to its higher fat content, which contributes to the soup’s richness. Wild salmon varieties like coho or sockeye provide more intense flavour but can be less forgiving if overcooked. Avoid pre-seasoned or smoked salmon, as these will alter the traditional taste profile significantly.
When selecting fresh salmon, look for firm flesh with a bright, fresh appearance and minimal fishy odour. The flesh should spring back when gently pressed. If using frozen salmon, ensure it’s completely thawed and pat it dry before adding it to the soup to prevent excess water from diluting the flavours.
Remove any pin bones before cooking, though some prefer to cook the salmon whole and flake it afterwards, removing bones during the flaking process. This method can provide more control over the final texture of the fish in the soup.
What herbs and seasonings enhance salmon soup flavour?
Fresh dill, bay leaves, white peppercorns, and sea salt represent the traditional Nordic seasoning approach for lohikeitto. Dill remains the most important herb, added fresh at the end of cooking to maintain its bright, distinctive flavour that complements salmon beautifully.
Bay leaves should be added during the initial stock-making phase and removed before serving. They provide subtle depth without overwhelming the delicate fish flavour. White peppercorns offer gentler heat than black pepper and maintain the soup’s pale colour, though freshly ground black pepper works perfectly well.
Some modern variations incorporate fresh parsley for colour and freshness, or a small amount of fresh thyme for earthiness. Lemon juice brightens the finished soup, though it should be added sparingly to avoid overpowering the salmon. A small knob of butter stirred in just before serving adds glossy richness.
Avoid strong herbs like rosemary or sage, which can dominate the subtle salmon flavour. The goal is to highlight the fish rather than mask it with competing flavours. Salt should be added gradually, tasting as you go, since salmon naturally contains some sodium.
Can you make salmon soup without cream or dairy?
Coconut milk, cashew cream, or oat cream successfully replace traditional dairy while maintaining the soup’s characteristic richness. Full-fat coconut milk provides the closest texture match, though it adds a subtle tropical note that some find appealing with salmon.
Cashew cream, made by blending soaked cashews with water, creates neutral-tasting richness without competing flavours. Oat cream offers another plant-based alternative that works particularly well in Nordic cuisine, maintaining the soup’s traditional character while accommodating dairy-free requirements.
To maintain richness without any cream substitute, focus on developing a more concentrated fish stock and allow some of the potatoes to break down naturally, creating body through starch rather than dairy. This approach produces a lighter but still satisfying soup that you can enjoy at authentic Nordic restaurants.
When using plant-based alternatives, add them gradually and avoid boiling vigorously, as some non-dairy creams can separate under high heat. Coconut milk should be stirred well before adding, as it often separates in the tin. The key lies in gentle heating and careful seasoning adjustment, as plant-based creams may require slightly different salt levels from traditional dairy cream.


