Reduce the heat to low and simmer gently for 4 hours, stirring occasionally.
Turn off the heat and cool slightly. Refrigerate the soup overnight.
Reheat the soup over medium heat, whisking to loosen the texture.
Remove the ham hocks and kielbasa to a board.
Shred the ham hock meat and discard the bones and tough skin. Return the shredded meat to the pot.
Also slice and add the kielbasa.
Heat until the soup just begins to simmer. Ladle into bowls and serve hot.
NOTES
1. Can I halve the recipe? Yes. Use half of each ingredient and the same method; simmer time remains long so the peas fully break down.2. Can I use chicken stock? You can, though the flavor will be lighter. Beef stock gives the soup a deeper, more traditional taste.3. How thick should it be? Erwtensoep is famously thick—your spoon should stand almost upright. Adjust with hot stock to your liking.4. Variations
Smoky bacon finish: Stir in crisp bacon bits at the end for extra crunch.
Root veggie boost: Add diced celeriac or carrot during the long simmer.
Herb note: Drop in a bay leaf while simmering and remove before serving.
5. Storage
Fridge: Up to 3 days, covered.
Freezer: Up to 3 months in portioned containers.
Reheat: Warm gently; whisk in a splash of hot stock or water if very thick.