Heat oil in pan, add onion, saute till onion turns golden brown. Then add ridge gourd. Fry and stir well for about 3-4 min. Then add red chili powder & ginger garlic paste / Kolhapuri masala mix well and fry for 2-3 min. Then add ridge gourd & moong daal and mix well. Then add 2-3 tbsp water cover with lid and cook for about 7-8 min till ridge gourd is cooked and tender. Switch off the flame, and serve hot with chapati.
It is dry bhaji / sabji so keep in mind water requirement to avoid overcooking. U need to taste whether it has been cooked or not.