Heat the oil in a big skillet until it starts to shimmer, then add the garlic, ginger and onion.
Cook for 4 minutes or until a bit tender.
Add the lamb and cook for 10 minutes or until just browning, breaking it up with a wooden spoon.
Stir in the sweet potato and curry powder, then cook 2 minutes.
Stir in the coconut milk, then season with some salt and black pepper.
Partially cover the pan and simmer for 15 minutes or until the sweet potato is soft.
Stir in the peas and cook, stirring, for a minute or until they are hot.
Stir in the cilantro or mint.
Serve with rice or Indian bread, with hot sauce on the side.