Chop all the vegetables. Transfer chopped carrot, beans, potato, knol khol or cabbage, grean peas into a pressure cooker. Add in salt and a pinch of turmeric and cook well by making 2 whistles. Please note you should not add onion and tomato.
Take all the ingredients listed under "for grinding" as per the measurement.
Transfer all the above ingredients along with coconut into a mixe jar or blender. And make a fine paste using required water. Set it aside.
Take 4 tsp of oil in a wok or frying pan and heat it. Now prepare tempering using mustard seeds, urad dal and curry leaves.
Add in chopped onions and fry until soft.
Add in chopped tomatoes and fry until tomatoes are soft.
Next add in cooked vegetables
Add in ground spices or masala.
Add in required water, salt and mix well. Please note you have already added some salt while cooking the vegetables. Also the sagu should be having thick gravy consistency.
Bring it to boil. Serve it with hot set dosa or poori or chapathi or any other dosas.