Soak the raw rice in water for 4 hours, then rinse and drain thoroughly.
In a saucepan, prepare jaggery syrup by combining 300 grams of jaggery with 3/4 cup of water. Heat until the jaggery dissolves completely. Set aside to cool.
Once cooled, grind the soaked rice along with the jaggery syrup and cardamom pods into a smooth batter. Add all-purpose flour to the batter and mix well.
Incorporate a pinch of salt, sesame seeds, and ghee into the batter. Stir until everything is well combined.
Allow the batter to ferment for about 14 hours, covered, in a warm place.
Mash the banana and add this to the batter. Mix all together very well.
Heat coconut oil in a deep frying pan. Once the oil is hot, reduce the flame to medium.
Pour the batter into the oil from the middle in small batches. As the batter begins to rise to the top, reduce the flame to low.
Continuously pour hot oil over the top of the Neyyappam to ensure even cooking.
Fry until the Neyyappam turns golden brown and crisp on all sides.
Remove from the oil and drain excess oil on paper towels.
Serve warm and enjoy the delicious Kerala style Neyyappam!