Open-Faced Mackerel Sandwich on Rye with Crème Fraîche
Why this recipe works
- Fast no-cook assembly: Using ready-to-eat mackerel keeps the recipe practical for a quick lunch or light supper.
- Bright, balanced richness: Lemon and Dijon cut through the crème fraîche and oily fish, keeping the sandwich fresh rather than heavy.
- Clean texture contrast: Dense rye, soft flakes of mackerel, crisp cucumber and finely sliced onion give each bite structure and freshness.
Get the most out of this recipe
Authenticity notes
- Nordic-style structure: The combination of rye bread, fish, dill and cultured dairy follows the logic of Nordic open-faced sandwiches rather than a closed sandwich format.
- Rye and oily fish: Earthy rye is a natural match for mackerel, helping balance its richness with a firm, savoury base.
Ingredient notes
- Choose ready-to-eat mackerel: Use fully cooked, properly chilled mackerel and flake it gently, checking for any pin bones as you go.
- Balance the spread: Taste the crème fraîche before assembling; the lemon should brighten the fish without making the spread harsh.
- Slice toppings finely: Very thin cucumber and red onion sit neatly on the rye and make the sandwich easier to eat.
Make-ahead tips
- Keep components separate: Store the spread, fish, sliced vegetables and bread separately in the fridge if preparing ahead.
- Assemble at the last moment: Build the sandwiches just before serving so the rye stays firm and the cucumber remains crisp.
Serving ideas
- Finish simply: Extra dill, a little black pepper or a touch more lemon zest keeps the flavour sharp and clean.
- Serve with something crisp: Pair with a simple green salad or pickled vegetables for a light, refreshing lunch.
Equipment you'll need
Ingredients
Instructions
- In a bowl, whisk the crème fraîche with finely grated lemon zest and 1 to 2 tsp lemon juice, then whisk in the Dijon mustard. Season with the fine sea salt and black pepper. Finely chop most of the dill and stir it through, reserving a little to finish.
- Slice the cucumber thinly and slice the red onion as finely as you can. Flake the mackerel into bite-sized pieces, checking for any pin bones as you go.
- Lay out the rye bread and spread each slice generously with the lemony crème fraîche. Top with cucumber, then mackerel, then a little red onion. Finish with the reserved dill and serve straight away so the bread stays firm.
Recipe notes
Tips
- Taste the crème fraîche spread before assembling and adjust with a little more lemon juice if you want it sharper.
- For the cleanest bite, slice the cucumber and red onion very thinly so they sit neatly on the rye.
- If serving to vulnerable groups, use mackerel that is fully cooked and properly chilled, and keep the sandwiches refrigerated until serving.
Substitutions
- Replace Crème fraiche with Greek yogurt for a lighter, sharper spread.
- Replace Dijon mustard with whole-grain mustard for a more textured, milder heat.
- Replace Rye bread with sourdough bread for a less earthy, more open-crumb base.
Storage
- Refrigerate up to 1 days
- Best eaten immediately. If needed, store the components separately in the fridge and assemble just before serving to prevent the rye bread from softening.
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Recipe overview
- Servings: 2 servings
- Total time: 10min (10min active)
- Difficulty: Easy
- Cuisine: Nordic
-
Allergens:
Fish Gluten Milk Wheat
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