You can use masoor dal or yellow moong dal in place of moong dal.
Choose dal as per the availability.
Rinse them 4 -5 times.
Add 3 - 4 cups of fresh water and soak them overnight or at least 5-6 hours.
After that, discard the water and keep it aside.
In a bowl, add soaked dal, ginger, green chili, and salt.
Grind them into a smooth batter.
If you love crunchy dosa, grind them into a coarse batter.
For soft dosa, make a silky smooth batter.
Gradually add water while grinding.
Take the batter out in a bowl.
Adjust the salt, if required.
Add more water, if required.
Whisk it nicely and make medium consistency batter.
The batter should not be very thin or runny.
Heat dosa tawa.
Apply oil on tawa and wipe it.
When tawa is hot enough, add one ladder batter.
Spread it evenly in a circular manner.
Pour ½ tsp of oil.
Cook on medium flame until dosa starts to leave tawa from sides.
Once cooked nicely, flip and cook from the side for one minute.
Take the dosa on a serving plate.
Same way, prepare all dosa.
Serve hot Mixed Dal Dosa with chutney of your choices like coconut chutney, onion tomato chutney, green chutney, raw mango chutney, or pickle of your choice, fresh curd, sambhar.
Recipe by Zeel's Kitchen at https://zeelskitchen.com/recipe/mixed-dal-dosa-recipe-healthy-protein-rich-dosa/