firstly, in a large bowl soak 3 cup idli rice and 3 tbsp methi.
soak for 5 hours with enough water.
drain off the water and transfer to the blender or grinder.
blend to smooth batter adding water as required.
prepare slightly watery consistency batter as methi absorbs water and thickens batter.
ferment the batter for 8 hours or till it doubles.
mix the batter gently without disturbing air pockets.
add 2 tsp salt and mix gently. idli and dosa batter is ready.