Take chana dal and split yellow moong dal, wash it with water couple of times and soak it for about 4-6 hours.
Once the dal is soaked, you can visibly see that it has doubled in size and is soft when you try to pinch it. Drain the water completely from soaked lentils.
Add it to a food processor, along with ginger, garlic and green chilies. Grind it to a coarse texture and remove it in a bowl. Do not add water, also coarse texture gives nice crispy taste. If you use blender or other type of equipment, just be mindlful of coarse texture. Do not process it until it is smooth.
Add, seasoning – salt and turmeric powder. Add in chopped onions and chopped cilantro too. Give it a good mix. The more you mix, the lighter the batter becomes.
Just when the oil is heating up, add some soda and mix it very vigorously.
Heat up oil at around 350 F, medium heat. Once oil is hot, add the fritters with a spoon or just your hands.
I would suggest try frying one and see if it holds up the shape. Sometimes, it might disintegrate in the oil- then add 1 tbsp of besan (chickpea flour) and 1 tbsp rice flour can also be added for binding.
Fry them on each side for about 1-2 minutes until they are golden brown. Remove them on a paper towel lined tray.
Serve them with some fried chilies and green chutney.