Place the sweet potatoes, red lentils, onion, garlic, ginger, vegetable broth, diced tomatoes, curry powder, cumin, turmeric, salt, and black pepper into the slow cooker.
Stir everything together until the spices are evenly distributed.
Cover and cook on low for 6 to 8 hours or on high for 3 to 4 hours, until the lentils and sweet potatoes are soft.
Stir in the coconut milk and let the soup warm through for 10 minutes.
Ladle into bowls and top with fresh cilantro and a squeeze of lime.
Notes
If the soup thickens too much after sitting, stir in a splash of broth or water when reheating. The coconut milk keeps the texture smooth without needing an immersion blender, though a quick partial blend works if you prefer it creamier. Leftovers store well in the fridge for three days and reheat gently on the stovetop.Course: Soup
Cuisine: Indian
Equipment: Slow Cooker