Boil water with salt and turmeric firstly.
Add cauliflower florets cut into bite size pieces. Boil for for 3-4 minutes. Drain and keep aside. Refer notes.
Heat a pan with oil and splutter cumin seeds.
After that, add finely chopped onion and fry till transparent.
Add the tomatoes chopped finely, red chilly powder, sambar powder and salt to taste.
Cook for 2 minutes until it turns mushy.
Add cauliflower and mix well.
Level and cook covered in low flame for 5-6 minutes.
Stir in between every 2 minutes.
Add oil as you mix.
Stir fry until the masala becomes dry and shiny. Lastly add coriander leaves.