While the oil is heating up, in a bowl, add besan (chickpea flour) aong with the spices - coriander, cumin, turmeric, red chili powder, and salt. Mix well.
Add green chili if using (optional), add the chopped spinach, and mix gently with a spoon.
Add water in small quantities and mix well. Add enough water to get a thick batter.
Once the oil is hot, drop spoonfuls of the batter into the oil. Fry till golden brown.
Enjoy with green or red chili sauce or tamarind/date chutney.