Cut onion into small pieces.
Add it into a mixing bowl, also add ginger-garlic paste, chopped green chilli, chopped green chilli, cumin seeds, ajwain, hing, coriander seeds, red chilli powder, coriander powder, garam masala and salt to taste. Mix well.
Add besan and mix well with onion and masala.
Add water gradually and make a thick batter.
Then add baking soda and lemon juice. Mix well into the batter.
Heat oil in a pan greases hands with water, pinch balls sized hand and make a round shape.
Deep fry in hot oil keeping the flame on medium.
Stir occasionally, and fry on medium flame until the pakoda turns slightly golden brown in color.
Drain off bhajiya from hot oil.
When bhajiya is hot, press slightly and add hot oil to fry it again.
Fry onion tikdi on medium flame till it becomes crispy and golden brown from the outside.
Serve crispy onion tikdi with tomato ketchup or chutney.