Blend all the ingredients under the list " For Masala " to a smooth paste using little water, keep it aside.
In a pressure cooker or in a deep kadai, heat oil , add mustard leaves , curry leaves , broken red chillies , onions and tomatoes , fry well.
Add blended masala paste and fry till oil separates.
Then add all cut mixed vegetables and green peas mix well cook for 2-5 minutes.
Add 1 ½ cup blender rinsed water, salt to taste and pressure cook for 1 whistle.
Once pressure settles on its own. Open the lid, add milk and keep on simmer for 5 minutes.
Serve saagu with poori or rava idli .