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Lentil Kielbassoulet

This hearty lentil and kielbasa cassoulet is a clever, high-protein twist on the classic French bistro favourite. By combining smoky Polish sausage with earthy beluga lentils and a mix of wild mushrooms, this dish delivers a deep, savoury flavour that feels both sophisticated and deeply soul-warming. It is a fantastic option for a weekend dinner, offering all the rich complexity of a slow-cooked stew but with a much shorter preparation time.

Topped with a generous layer of crisp, garlic-infused sourdough breadcrumbs and fresh fennel fronds, this one-pot meal provides a wonderful contrast of textures. It is an excellent choice for batch cooking, as the flavours develop beautifully over a few days in the fridge. Serve it in deep bowls on a chilly evening for the ultimate comforting homemade feast that the whole family will enjoy.

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Ingredients for Lentil Kielbassoulet

  • 120ml plus 45ml extra-virgin olive oil, divided

  • 450g wild mushrooms (such as maitake or oyster), torn into 2" pieces

  • 2 1/2 teaspoons kosher salt, divided

  • 450g kielbasa sausage, cut 1" thick on a diagonal

  • 1 large fennel bulb, fronds finely chopped, bulb finely chopped

  • 1 large onion, finely chopped

  • 2 medium carrots, peeled, finely chopped

  • 2 celery stalks, finely chopped

  • 11 garlic cloves, 8 thinly sliced, 3 left whole

  • 1 tablespoon thyme leaves

  • 1 1/4 teaspoons hot smoked Spanish paprika

  • 1/2 teaspoons crushed red pepper flakes

  • 45ml double-concentrated tomato paste

  • 475ml black beluga or French green lentils

  • 1 baguette, torn into 2" pieces

Preheat oven to 177°C. Heat 60ml oil in a large Dutch oven over medium-high until smoking. Add mushrooms and cook, undisturbed, until golden brown underneath, about 5 minutes. Turn mushrooms over and cook, undisturbed, until browned on the other side, about 5 minutes. Season mushrooms with 1/2 teaspoons salt; transfer to a plate.

Add 45ml oil to same pot and add sausage, arranging in a single layer. Reduce heat to medium and cook, undisturbed, until browned underneath, about 3 minutes. Turn sausage over and cook on second side until browned, about 3 minutes. Add chopped fennel bulb, onion, carrots, celery, sliced garlic, and 1 teaspoon salt and cook, stirring often until vegetables are softened but have not taken on any colour, 10–12 minutes. Add thyme, paprika, and red pepper flakes and cook, stirring, 1 minute. Add tomato paste and cook, stirring occasionally, until paste darkens in colour and begins to stick to the bottom of pot, about 1 minute.

Stir mushrooms, lentils, and 1 teaspoon salt into sausage mixture and add 1925ml water. Increase heat to medium-high and bring to a boil. Reduce heat to low, cover pot, leaving lid slightly askew, and continue to cook, stirring a few times, until most of the liquid has been absorbed and stew is thick and lentils are barely al dente, 25–30 minutes.

Meanwhile, pulse bread in a food processor until coarse crumbs form (the largest ones should be about 1/2"). Transfer breadcrumbs to a large rimmed baking sheet and arrange in an even layer. Drizzle with remaining 60ml oil and toss to evenly coat. Bake until deep golden brown, 25–30 minutes. Remove from oven and finely grate remaining 3 garlic cloves over breadcrumbs; toss to incorporate. Add fennel fronds (you want to have about 120ml ) and toss again to combine.

Scatter half of breadcrumbs evenly over stew. Transfer pot to oven and cook stew, uncovered, until some of the breadcrumbs have cooked into the stew and stew is bubbling around the edges, 13–15 minutes.

Scatter remaining breadcrumbs over stew and cook until stew is very thick, 10–15 minutes.

Do Ahead: Kielbassoulet can be made 3 days ahead. Let cool; cover and chill. Reheat, uncovered, in a 177°C oven.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 28 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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