Soak, wash and pressure cook the millet in a cooker with 2 cups of water upto 2 whistles.
Add milk and mash it well when it is hot. Once it cools, add curd, salt needed and mix well.
Heat oil in a pan; add mustard seeds, when it splutters, add green chillies, ginger, and curry leaves and carrot. Saute for 2-3 seconds and add it to the samai thayir sadam.
Add grated carrot, finely chopped cucumber, mangoes and garnish with coriander leaves.