Kartoffelmad med Ristet Løg
(kar-TOFF-el-mal meth RIS-teth loy)
Matpakke & Smørrebrød (The Rhythms of the Nordic Day)
Drag a heavy knife through a cold boiled Yukon Gold potato. It began as a working-class necessity, a genius way to use up last night's leftovers—a dish that requires a knife, a fork, and a little damn respect. The secret is purely structural. You chill the potatoes until they are structurally sound, waterproof the dense seeded rye bread with a heavy slather of salted butter, and take fifteen minutes to fry your own onions. Bury the top in a shatter of crispy onions and eat it before the bread bends.
Before you start
Boil and thoroughly chill the potatoes.
Do this the day before. Drop whole potatoes in heavily salted water and boil until fork-tender, about 15 to 20 minutes. Drain and chill them in the fridge overnight. This is non-negotiable—chilling fundamentally changes the starches, ensuring they slice perfectly instead of turning to sad, crumbly mush.
Ingredients
- waxy potatoes8 small
- yellow onions2 med
- all-purpose flour2 tbsp
- neutral oil1/2 cup
- coarse sea salt1 tsp
- dense pumpernickel bread4 thick slices
- salted butter2 tbsp
- high-quality mayonnaise4 tbsp
- fresh chives1 bunch
- red radishes2 med
- flaky sea salt1 tsp
- black pepper1/2 tsp
Method
- 01
Toss the onions in flour and aggressively shake off the excess.
Put the floured onion slices in a wire mesh sieve and shake them out. If you leave excess flour, your oil will burn prematurely. Heat the oil in a skillet over medium heat to about 300 degrees Fahrenheit.
- 02
Fry the onions to a sweet, golden crunch.
Fry the onions in small batches. Pull them out with a slotted spoon right before you think they are completely done, as carryover cooking will darken them further. Drain on paper towels and hit them with coarse salt while they are still hot.
- 03
Waterproof the structural foundation.
Lay out the heavy, dense pumpernickel bread. Smear each slice generously with room-temperature butter from edge to edge to create a hydrophobic barrier that defends against the moist toppings.
- 04
Shingle the potatoes and crown the sandwich.
Slice the cold potatoes a quarter-inch thick and shingle them beautifully over the buttered bread. Lay down a thick stripe of mayonnaise right down the center. Pile high with the crispy onions, snipped chives, radish slices, flaky salt, and cracked pepper. Eat it immediately with a knife and a fork.
Notes
The Bread Reality.
Standard American rye bread is a soft, wheat-based lie that will turn into a soggy mess here. Seek out the dense, foil-wrapped bricks of German-style pumpernickel in the international aisle to provide the necessary structural integrity.
The Mayonnaise Hack.
If you want to mimic the slight tang of Danish homemade mayo without whisking it yourself on a weeknight, stir a microscopic splash of white wine vinegar or lemon juice into your high-quality jarred mayonnaise.