Slice the onions thinly.
In a bowl, mix the chickpea flour, cumin, coriander, chili powder and salt.
Add the sliced onions and mix well, adding water as needed to form a thick batter.
Heat oil in a pan and drop spoonfuls of the batter into the hot oil.
Fry until golden brown on both sides.
Drain on paper towels and serve hot.
