
This cozy, spice-warmed soup practically cooks itself, letting red lentils break down slowly into a thick, velvety base studded with tender carrots, celery, and onion. Cumin, coriander, smoked paprika, and a whisper of turmeric and cayenne build layers of warmth, while a finish of fresh lemon juice brightens every spoonful. The slow cooker does all the heavy lifting, transforming a handful of pantry staples into a porridge-like, deeply comforting bowl with almost no hands-on effort. A scatter of fresh parsley and a lemon wedge on the side make it feel like something special, even though it's built from humble ingredients. It's a satisfying, wholesome option that fits easily into a vegetarian lineup, whether you're meal-prepping for the week or just want a low-effort dinner that delivers big on flavor.
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Add the olive oil, onion, carrots, celery, garlic, rinsed lentils, diced tomatoes (with their juices), chicken broth, cumin, coriander, smoked paprika, turmeric, cayenne, salt, and black pepper to a 6-quart slow cooker. Stir to combine.
Cover and cook on Low for 7–8 hours or on High for 3–4 hours, until the lentils have completely broken down and the vegetables are very tender.
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