Mix the flour, salt and
buttermilk then add just enough water to make a
batter of pouring consistency. Add the chilies and
coriander.
Heat the oil and fry the remaining
ingredients until the mustard seeds start crackling.
Pour into the dosa batter. Heat a heavy-based pan and
smear with oil.
Pour a ladleful of batter into the
pan and spread to a 15cm/6 in circle. Pour a
spoonful of oil around the edges and cook for about
2 minutes until each side is golden. Serve hot with
coconut chutney.