To begin making the Tomato Onion Tadka Raita, firstly chop the tomato, onion and cucumber finely and keep it aside.

Now, take curd in a bowl, add a little water and whisk it properly. Add the vegetables and required salt in the whisked yogurt and mix well.

The next step is to temper the raita. Heat a tadka pan with required oil. Once it is hot add curry leaves, cumin seeds, mustard seeds and allow to crackle for about 10-15 seconds. 

Once done turn off the heat and  pour the tadka over the curd and mix the Tomato Onion Tadka Raita properly. 

Serve Tomato Onion Tadka Raita along with Aloo Sabz Dum Biryani and Papad for a weekday meal.