Peel and grate the bottle gourd and squeeze out the excess water from the grated bottle gourd into a bowl.
In a deep bowl, combine grated bottle gourd, wheat flour, rice flour, gram flour, ginger garlic paste, green chili paste, turmeric powder, lemon juice, sugar, baking soda, asafoetida, salt, coriander, and oil to mix them well and knead into a soft dough.
Apply oil on your hands and divide the mixture into 3-4 equal portions.
Shape the portions into a cylindrical roll.
Take a sieve, grease it with oil, and place two rolls on it. In a steamer, steam them for 20-25 minutes.
After that, steam the remaining two rolls.
Take them on a plate, and once cool, cut them into small slices and keep them aside.
For tempering, heat the oil in a pan and add mustard seeds, cumin seeds, sesame seeds, asafoetida, and curry leaves and saute for 30-40 seconds on medium flame.
Add the sliced doodhi muthiya to the pan and saute for 4-5 minutes or until light brown and crispy.
Take doodhi muthiya on a plate, garnish them with finely chopped coriander, and serve.