In a bowl add milk and vinegar. Let it stand for 10 minutes. Add mashed Banana.
Add flour, fennel seeds, salt , jaggery and mix well. There should not be no lump.
Add a little water if the mixture looks dry.The consistency should be not runny. It should be like Dosa batter which can be spreadable.
Heat a cast iron pan or a griddle . Grease the pan with Ghee. Pour batter to make different sized pancakes. Around 1/4 cup is enough to make one pancake. Drizzle a tsp Ghee on each pancake edge and flip to cook the other side at medium flame. You will get a nice golden brown colour on both side .