Hearty Swedish red lentil soup simmered with garden leeks, carrots, celeriac, and warm allspice, served with a swirl of sour cream (gräddfil) and fresh dill.
Melt butter in a soup pot over medium heat. Sauté sliced leek, carrots, celeriac, and garlic for 6-8 minutes until tender and fragrant.
Stir in rinsed red lentils, allspice, bay leaf, and pour in vegetable broth. Bring to a rolling boil.
Reduce heat, partially cover, and simmer gently for 20-25 minutes until lentils are meltingly soft and soup is thick and velvety.
Remove bay leaf, season with salt and white pepper. Ladle into bowls and garnish with a dollop of gräddfil and fresh dill fronds.