Mix jaggery with water and heat it up for few minutes until it is slightly thick(no consistency needs to be checked). Heat it up until jaggery gets dissolved. Strain to remove the impurities.
Strain the jaggery syrup to remove impurities, collect it in a bowl. Heat it up and cook for few minutes to make the syrup thick like honey in consistency.
Soak rice in water for at least 3 hours. Drain water and grind rice with very little water to a fine paste preferable in grinder because it minimizes water. Now add this jaggery syrup to the rice paste.
Keep mixing so that jaggery is evenly mixed. Make sure to make a flowing slightly runny batter.
Add cardamom powder, coconut, cooking soda and mix well. If you don't want to add baking soda skip it and Set the batter aside for another 2 hours for fermentation. Then heat paniyaram pan , add a teaspoon of ghee / oil in each hole.
Pour a ladle full of the batter in each hole. Cook covered for a minute.
When cooked on one side , carefully flip to other side - add oil / ghee if required. Cook until both sides are golden brown. Remove and nei appam is ready! Similarly repeat to finish the batter.
Serve hot!! The aroma of ghee with the appams is special about this nei appams.