Pour in the tin of tomato. Add the lentils, sweet potatoes and boiling water.
Simmer on medium heat for about 45 minutes, check on the water every now and then and top up a little bit if it looks too thick. You want the stew to be thick but to still have a fair amount of sauce with it.
Once the lentils are soft and the sweet potatoes are cooked through, add herbs, salt & black pepper to taste and coconut milk. Stir in and serve.
Recipe Notes
I like to serve this stew with some gluten free french bread.