Prepare the Moong Dal: Rinse the split moong dal thoroughly under running water. In a pressure cooker, add the moong dal and 1 cup of water. Pressure cook for 2 whistles on medium heat.

Let the Pressure Release Naturally: Once the pressure has released completely, open the lid and check the moong dal. It should be cooked soft and have a paste-like consistency.

Make the Batter: In a large mixing bowl, combine the cooked moong dal, chopped onion, chopped green chillies, salt, gram flour, and semolina. Mix well until a thick and consistent batter forms. Add a little water only if necessary to achieve a semi-thick pouring consistency.

Cook the Moong Dal Base: Heat 2 teaspoons of oil in a non-stick pan. Divide the batter equally into two portions. Pour one portion of the batter into the pan and spread it evenly to form a round or square shape. Cover the pan and cook for 3-4 minutes on medium heat.

Flip and Cook: Once the bottom is golden brown, carefully flip the moong dal base using a spatula. Cook for another 3-4 minutes on medium heat, or until cooked through.

Assemble the Sandwich (Optional): Once the moong dal base is cooked, transfer it to a plate. You can enjoy it as is, or assemble a sandwich with your desired fillings.