Preheat oven to 350°F Fahrenheit.

Cut the sweet potatoes into bite size cubes.

Place coconut milk, tomatoes, turmeric, cumin and ground ginger in a large saucepan. Heat until bubbling. Add sweet potatoes, lentils, olives, coriander, and salt and pepper.

Put a lid on the pot and put it in the oven. Cook for about an hour until sweet potatoes are soft.

Squeeze lemon juice over pot of lentils and serve. Can be served over rice.