Heat the oil in a large saucepan. Steam the onions and chilli flakes in it. Add the garlic and ginger and stir-fry for another 3 minutes. Add the sweet potato cubes, curry powder and caraway seeds and sauté briefly. Pour coconut milk on top and add salt to taste. Cover everything and let simmer for 15-20 minutes over low heat.
Finally, serve the curry with chopped mint and chopped coriander.
I really enjoy cooking jasmine rice with it. The curry can also be eaten without any other side dishes.
P.S .: The dish also tastes great with pumpkin instead of sweet potatoes.