Boil raw banana/plantain in enough water for 7-10 mins on medium flame.
Drain off excess water. The cooked banana should be firm, let it completely cool down.
Remove the skin and grate the banana. Set this aside.
In a pan, heat 2 teaspoon of oil. Add jeera and finely chopped green chillies.
As they begin to crackle, add finely chopped onion.
When the onions turn translucent, add ginger garlic paste. Fry for a minute.
Next add red chilli powder, garam masala powder, turmeric powder and salt as needed. Cook for a minute.
Add gram flour and cook it for 3-4 mins on low flame.
Add this mixture to the grated bananas along with finely chopped coriander leaves. Mix it well.
Make patties/tikkis of equal size with thickness of about a cm.
Press each patty in semolina/rava until all sides are coated well.
Meanwhile heat a cast iron pan/heavy bottomed tawa with 1 tablespoon of oil on medium flame. Once hot, set the flame on low. Place 6-7 patties on the pan and cook for 2-3 mins on each side.
Once the bottoms look cooked/crisp, carefully flip them over and cook on the other side too.
I placed the cooked tikkis on the side while the next batch was cooking. This helps get the edges and sides get crispy too.