Rinse the rice and dals separately and soak them overnight or for at least 4-5 hours in enough water.
Drain the water from the soaked rice and dals and grind them separately in a mixer grinder or food processor to a fine paste. Add a little water if necessary.
In a mixing bowl, combine the ground rice and dal, cumin seeds, chopped green chili, grated ginger, and salt to taste. Mix well.
Add water gradually to the mixture to form a batter of pouring consistency. Keep it aside for 10-15 minutes.
Heat oil in a deep frying pan on medium heat.
Once the oil is hot, take a ladleful of batter and pour it into the oil. Fry until golden brown and crispy on both sides.
Remove the fried Dhuska from the oil using a slotted spoon and place them on a plate lined with paper towels to absorb any excess oil.
Repeat the process with the remaining batter.
Serve hot with aloo dum or chana dal curry, and mint or tamarind chutney.