A watercolour of dark dense rye bread slices topped with flaked mackerel and green gherkin — Generated with OpenAI gpt-image-1

Adapted from The northern European open sandwich

Pumpernickel with mackerel and gherkin

Name: Pumpernickel with mackerel and gherkin
Prep time: 5 min
Total time: 5 min
Yield: 2 servings
Ingredients: 120 g Pumpernickel (vacuum-packed); 1 pack Mackerel fillets (tinned); 60 g Gherkins (pickled); 10 g English mustard; 2 g Black pepper (ground); 10 ml Lemon juice (bottled)

An established dish converted to shelf-stable ingredients. Every substitution is documented below.

How long it keeps

About 12 months, set by Gherkins (pickled), though 1 of 6 ingredients has no sourced figure, so the real limit may be shorter.

Indicative, for planning a build before you buy. The answer for a pack you already own is the best before date printed on it, and that only holds if it has been stored as the label says.

Serves

Burners

Pans

Water

0.05 L

Active

5 min

Total

5 min

Ingredients

Five minutes, no heat, and the densest calories-per-effort ratio on the site.

Pumpernickel sliced thin: it is heavy bread and thick slices are too much.
A scrape of mustard on each.
Drained mackerel flaked over, lemon juice, plenty of pepper.
Gherkin sliced lengthways on top.

Check how your pumpernickel was sold. Ambient and marked best before, it is shelf-stable; from a chiller and marked use by, it is not, whatever the vacuum packing suggests. See vacuum-packed food.

Serves 2.

What this was adapted from

The northern European open sandwich: dense rye, oily fish, something pickled

fresh rye bread and soured cream → vacuum-packed pumpernickel and mustard

Pumpernickel is sold vacuum-packed and keeps for months unopened, which fresh rye does not. Soured cream needs a fridge; mustard gives the sharp note instead, drier and hotter.