Peel and cut the plantains into bite-sized cubes.
Mix the spices - ginger, garlic, chilli powder, nutmeg and salt. Sprinkle the spice mix over the plantain and rub it in well.
Heat the olive oil and when hot, add the cubes of plantain to the oil with a slotted spoon ensuring the pieces are not touching. You may need to do this in batches.
Fry for a few minutes, turning over every now and then, until golden brown.