Add the lentils, broth, and crushed tomatoes. Increase the heat to bring to a gentle simmer. Cook uncovered, stirring occasionally, until the lentils are tender but not mushy, about 25 minutes. If the soup is thicker than you would like, splash in a bit of water to reach your desired consistency. (We like our soup fairly thick.)
Remove from the heat and stir in the lemon juice. Taste and add additional salt as desired (the amount you need will vary based on your vegetable broth). If you'd like it spicier, add a touch of additional cayenne (a little goes a long way). Serve warm, topped with chopped fresh cilantro.
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Curry Lentil Soup https://www.wellplated.com/curry-lentil-soup/