Cover 250 g moong dal with water and leave to soak for 2 to 3 hours.
Drain the dal, reserving 250 ml of the soaking liquid. Transfer the dal to a blender along with 2.5 g ginger, 24 g green chilli, and salt to taste, then purée until smooth. Pour into a bowl and stir in enough of the reserved liquid to create a thick batter.
In a separate bowl, toss 300 g onion and 50 g coriander leaf with the spices for the onion topping, then set aside.
Set a frying pan over medium heat and add a teaspoon of the 228 g vegetable oil. Ladle a portion of batter into the centre and quickly spread it outwards into a thin round.
Drizzle half a teaspoon of oil around the edges and cook for about 2 minutes, until the bottom turns golden brown.
Scatter some of the spiced onion mixture over the pancake. Drizzle a little more oil over the top and cook for another 1 minute, until the edges are nicely crisped.
Fold the pancake in half and transfer to a warm, covered dish. Repeat the frying and filling process with the remaining batter, and serve hot accompanied by sambhar and garam masala.
Use equal weight. It cooks in about the same time and breaks down to a similar soft, creamy consistency, though the colour will be slightly pinkish-orange.
Use 80% of the weight, finely shredded and browned slowly with a pinch of asafoetida. Replicates the bulk and natural sweetness in gravies without allium.