Cook vegetables:Melt butter in a small pot or large saucepan over medium heat. When foam subsides, add onion, carrots, and celery and cook, stirring occasionally, until vegetables are beginning to soften but not developing any color, 8 to 10 minutes.
Add garlic and spices:Stir in garlic, ginger, thyme, spices, 2 teaspoons salt, and 1/4 teaspoon pepper; cook until fragrant, about 1 minute.
Add tomatoes, lentils, and broth and simmer:Add tomatoes, lentils, and broth. Bring to a boil, then reduce heat to low, cover, and simmer until lentils are tender and creamy, 15 to 18 minutes.
Puree one-third of stew: Remove and discard thyme. Transfer about 1/3 of soup to a blender; purée until smooth.
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