Ingredients
Wheat flour - 1 cup
Onion(big) - 1 no
(finely chopped)
Red chillies(Kollamulaku) - 2 nos
Curry leaves - As reqd
Baking soda - A pinch
Oil - As reqd
Mustard seeds - A pinch
Cumin seeds(Jeerakam) - A little
Salt - As reqd 

Preparation Method

1)Heat oil in a pan or a kadai.

2)Splutter mustard seeds and cumin seeds.

3)Add onion, chillies and curry leaves and saute onion, till it becomes transparent.

4)Mix wheat flour with water, until it gets a watery consistency.

5)Add a pinch of baking soda along with the sauteed onions and mix well.

6)Use this batter to make dosas.