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Instructions
Gather the ingredients.
Bring chicken stock and lentils to a boil in a large saucepan over high heat. Reduce heat to medium-low, cover, and simmer for 20 minutes.
Meanwhile, heat olive oil in a skillet over medium heat. Stir in onion and garlic; cook until onion has softened and turned translucent, about 3 minutes.
Stir onion mixture into lentils; season with cumin and cayenne. Continue simmering until lentils are tender, about 10 minutes.
Puree soup in a standing blender or with an immersion blender until smooth. Stir in lemon juice and cilantro.