A hearty Swedish ärtsoppa-style split pea and potato soup, seasoned with allspice and marjoram and finished with mustard on the side.
Ärtsoppa, yellow split pea soup, is a genuine Swedish tradition eaten on Thursdays for generations, historically paired with pancakes for dessert afterward and, in earlier centuries, tied to the day working households did their washing since the soup could simmer unattended. This bowl leans on the same base — yellow split peas simmered with pork or ham, allspice and marjoram — but swaps in potatoes and green lentils for extra body, making it a heartier, faster weeknight version. The technique that matters most is skimming the foam that rises when the split peas first come to a boil; left in, it makes the soup taste muddy. From there it's a long, gentle simmer until the peas break down into a naturally thick, creamy base without any cream added — allspice and marjoram are what give ärtsoppa its distinct warm, slightly sweet backbone. Traditionally ärtsoppa is served with a squeeze of mustard stirred in at the table, which is exactly how this bowl is finished. It's simple, filling, cold-weather food that Swedish households have leaned on for a very long time, adapted here into an easy lentil-and-potato bowl format.
Serves 5
Melt butter in a large pot over medium heat. Cook onion for 5 minutes until soft and translucent.
Add split peas, ham hock, allspice, marjoram and water. Bring to a boil, then skim off and discard the foam that rises to the surface.
Skimming carefully in the first 5 minutes of boiling is what keeps the finished soup tasting clean instead of muddy.
Reduce heat to low, cover partially, and simmer for 35 to 40 minutes, stirring occasionally so the peas don't stick to the bottom.
Stir in diced potatoes and simmer 15 more minutes until the peas have broken down into a thick, creamy base and the potatoes are tender.
Remove the ham hock, shred the meat and stir it back into the soup. Season with salt and pepper, then ladle into bowls and serve with a spoonful of mustard stirred in at the table.
Skim the foam thoroughly in the first few minutes — this single step is the biggest difference between a clean-tasting and a muddy-tasting split pea soup.
Use real allspice berries, ground fresh if possible, for the warm background flavor that defines ärtsoppa.
If the soup gets too thick after resting, thin it with a splash of hot water rather than more stock, which can overpower the pea flavor.
Vegetarian: skip the ham hock, use vegetable stock, and add a teaspoon of smoked paprika for a similar smoky note.
Traditional pairing: serve with thin Swedish pancakes and lingonberry jam afterward, the classic ärtsoppa Thursday combination.
Extra hearty: stir in cooked green lentils along with the potatoes for more texture and protein.
Refrigerate for up to 4 days; the soup thickens considerably once cold, so thin with a little water when reheating on the stove over low heat.
Ärtsoppa is one of Sweden's oldest standing food traditions, historically eaten on Thursdays and linked to the Catholic custom of a lighter Friday meal that followed. It remains a fixture of Swedish school and military cafeteria menus to this day.
Yellow split peas are traditional and give the soup its characteristic golden color and slightly sweeter flavor, but green split peas will work in a pinch with a similar cooking time.
Older dried peas can take longer to break down. Keep simmering in 10-minute increments, and mash a few peas against the side of the pot to help thicken it faster.
It's not required, but the sharp bite of mustard stirred in at the table is the traditional Swedish way to eat ärtsoppa, and it cuts through the soup's richness noticeably.
Per serving (420g / 14.8 oz) · 5 servings total
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