Peel and grate 500 grams of bottle gourd (lauki/doodhi). Squeeze out the excess water and keep it aside.
In a mixing bowl, combine the grated bottle gourd, 200 grams of gram flour (besan), 100 grams of wheat flour, 1 teaspoon of ginger-garlic paste, 1 teaspoon of green chili paste, 1 teaspoon of sugar, 1/2 teaspoon of turmeric powder, 1 teaspoon of red chili powder, 1 teaspoon of coriander powder, 1 teaspoon of cumin seeds, salt to taste, and 2 tablespoons of oil. Mix well to form a soft dough.
Grease your hands with oil and shape the dough into cylindrical rolls (muthias) of about 5-6 cm in length and 2 cm in diameter.
Place the muthias in a greased steamer plate and steam for 20-25 minutes on medium heat. Check if they are cooked by inserting a toothpick; if it comes out clean, the muthias are ready. Allow them to cool.
In a pan, heat 2 tablespoons of oil. Add 1 teaspoon of mustard seeds and let them crackle. Then add 1 teaspoon of sesame seeds, a pinch of asafoetida (hing), and a few curry leaves.
Cut the cooled muthias into 1 cm thick slices and add them to the pan. Gently toss to coat the muthias with the tempering. Cook for 2-3 minutes on low heat.
Garnish with chopped coriander leaves and serve hot with green chutney or ketchup.