- Peel and cut lauki into rough pieces. 
- Heat oil in a pan, and add cumin seeds and coriander seeds. Saute for a minute. 
- Then add garlic, onion, and salt. Cook till onions are translucent and pink. 
- Now add whole wheat flour. Mix and cook for a minute with stirring constantly. 
- add chopped lauki and mix well. 
- Add water and mix well. 
- Then add coriander sprigs and spinach leaves. Cover the pressure cooker with the lid, and cook it for 2 whistles on medium flame. 
- Let the pressure go down by itself then open the lid and using a hand blender, make a smooth puree. 
- Place the cooker again on gas and check the soup consistency. If needed, add 1 cup more water. 
- Add crushed black pepper and garam masala. Mix well. 
- Boil for 2 minutes and serve hot.