In a kadhai / wok take water along with salt, turmeric powder and start boiling.
Into that add potato, papaya, pumpkin, colocassia and allow to cook over medium heat for 1-2 minutes first.
Then add rest vegetables, give a nice mix.
Cover the kadhai and allow to boil till all the vegetables are well cooked, but not overcooked .
Meanwhile, heat mustard oil in a tadka pan.
Add pancha phutana and allow to splutter over low-medium heat.
Then add chopped onion, crushed garlic cloves along with red chilies and green chilies.
Saute everything till onion turns translucent.
Pour the tempering over the cooked vegetables and gently give a mix.
Allow to cook for 1 minute more over medium heat.
Turn off heat and serve hot with some roti or even steamed rice !