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Mackerel, beetroot and Dijon on rye

Cooked mackerel with beetroot, Dijon and dill on dark rye.

By The foodose editorial team. Nutrition calculated from USDA FoodData Central. Checked on paper on 20 September 2026; not yet cooked in a test kitchen or photographed, so the times and yield are estimates. How we develop our recipes
What still needs a real kitchen
  • Photograph the finished open sandwich
Time
About 12 min
estimated
Serves
2
see below
Energy
465 kcal
per serving
Protein
35 g
per serving
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Not yet photographed. The panel names the dish’s main ingredients rather than showing a picture we have not taken.

Ingredients for 2 servings

2 servings

Check off ingredients as you go.

Contains fish, gluten, milk, mustard. Check the labels on packaged ingredients:

  • Dijon mustard. Many Dijon mustards also declare sulphites; check the label.
  • cooked beetroot. Beetroot in vinegar is a different product; this figure is for plain cooked beetroot.
  • cooked mackerel. Smoked mackerel carries far more salt than the cooked fillet used here; check the pack if you use it.
  • rye bread. Most rye bread also contains wheat; check the label.

Cooking steps

  1. Mix the yoghurt, Dijon mustard and lemon juice together in a bowl.

  2. Dice the beetroot and toss it with a spoonful of the dressing on its own, in a separate bowl.

  3. Flake the mackerel, discarding any skin, and check for bones.

  4. Spread the remaining dressing on the rye, add the dressed beetroot and the mackerel, and finish with the dill.

The useful detail

Dress the beetroot separately first. Beetroot bleeds the moment it meets anything pale, and dressing it on its own keeps the yoghurt white and the plate readable.

Make it work for you

One serving is One slice of rye with half the mackerel and beetroot. You can switch to a smaller portion in the ingredients above; it is three quarters of this, and it contains correspondingly less energy and protein. It is an option, not a goal.

  • Tinned salmon instead of mackerel

    Milder and less oily.

    Per serving: about 125 kcal less, about 1 g more protein, about 14 g less fat.

  • Quark instead of Greek yoghurt

    Thicker and sharper; it sits on the bread better.

    Per serving: about the same energy, about the same protein, about 1 g less fat.

  • Sourdough instead of rye

    Lighter under a strong fish; rye suits it better.

    Per serving: about 5 kcal more, about 1 g more protein, about the same fat.

Estimated nutrition

Per standard serving, calculated from the ingredients above. Nutrition changes with substitutions, brands and how much oil stays in the pan.

A lunch where an oily fish carries both the protein and the omega-3 fats, and the yoghurt does the job of a mayonnaise.

Nutrition per serving
Energy465 kcal
Protein35 g
Fat21 g
of which saturates5 g
Carbohydrate34 g
of which sugarsnot calculated
Fibre5 g
Sodium500 mg
Show calculation notes

Each ingredient’s weight is multiplied by its USDA FoodData Central values per 100 g. The whole recipe is added up and divided by 2. Raw weights are used for meat, fish and vegetables; beans and lentils are drained weights. All of the oil is counted as eaten. Added salt is not included; sodium from stock, bread, cheese and tinned food is.

Calculation, whole recipe
IngredientWeight usedSourceEnergyProtein
Greek yoghurt100 gFDC 170903Yogurt, Greek, plain, lowfat73 kcal9.9 g
Dijon mustard10 gFDC 2710085Mustard7 kcal0.4 g
lemon juice15 gFDC 167747Lemon juice, raw3 kcal0.1 g
cooked beetroot200 gFDC 169146Beets, cooked, boiled, drained88 kcal3.4 g
cooked mackerel200 gFDC 175120Fish, mackerel, Atlantic, cooked, dry heat524 kcal47.7 g
fresh dill10 gFDC 172233Dill weed, freshFresh dill is 43 kcal per 100 g on FoodData Central 172233, so the few grams a recipe uses add 2 or 3 kcal. That record has no sugars value, so the dill is listed here rather than counted, which keeps the recipe's sugars calculable.··
rye bread90 gFDC 172684Bread, rye233 kcal7.7 g
Whole recipeDivided by 2928 kcal69.1 g

Per serving the energy is rounded to the nearest 5 kcal, grams to the nearest whole gram and sodium to the nearest 10 mg. Ingredients marked “Not calculated” are excluded and could add at most 3 kcal to the whole recipe. of which sugars could not be calculated, because one ingredient’s record does not cover it; the row above says which. Calculation method 1.0, September 2026. How the calculation works.

Storage and reheating

In the fridge
Keep the dressed beetroot and the flaked mackerel in separate covered containers for 3 to 4 days. Assemble when you eat.
Reheating
Not needed; this is a cold dish.

Checked against US Food and Drug Administration, Refrigerator and Freezer Storage Chart, USDA Food Safety and Inspection Service, Leftovers and Food Safety, FoodSafety.gov, Safe Minimum Internal Temperatures and FoodSafety.gov, Cold Food Storage Chart. UK guidance from the Food Standards Agency is shorter, at two days for most leftovers.

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