Mix the flour, salt, sugar and yeast in a bowl, use a round bladed knife to stir in the milk and mix to form sticky dough. Lightly knead on a floured surface for 5 minutes until smooth, elastic and no longer sticky.
Return to the bowl, cover and keep in a warm place for 1 hour or until the mixture doubles in size.
Preheat the oven to 220 C / Gas 7.
Tip the dough onto a floured surface, divide into 4, then use a rolling pin to roll each into a 20cm circle.
Scatter the olives and basil in the centre of the dough circles. Brush a little water around the edges, then roll again to seal in the filling and make a tear shaped bread. Melt the butter or ghee and brush on both sides of the naan.
Bake in the preheated oven or in a tandoor oven until golden and puffy, about 8 minutes. Remove from the oven smear with butter, cut and serve with curry.