Beat the Dahi (1 cup) with Water (1/2 cup) and then add the Semolina (1 1/2 cup) and Salt (to taste) to make batter of dropping consistency.
Cover and keep aside for 4 hours to ferment.
Then, add the Tomato (2 tablespoon), Onion (2 tablespoon), and Green Chili Pepper (1) to the fermented batter.
Heat the appe mould on a medium flame and grease it with a little Oil (1 tablespoon).
Take a kadai or pan, heat Oil (1 tablespoon) and add Mustard Seeds (1 teaspoon), splutter it & add Curry Leaf (7), Fresh Cilantro (1 tablespoon) and switch off the flame.
Now add this tadka into the batter. Mix well. At this time add Baking Soda (1 pinch) into batter.
Pour a spoonful of the batter into each mould.
Cook till the outer surface becomes golden brown and then turn each appe upside down using a fork so as to cook the other side.
Remove and repeat with the remaining batter.
Serve hot with chutney or tomato sauce.