Take a frying pan and heat it on a low flame on your gas oven.
When the frying fan is sufficiently hot, add 4 tbsp of cumin seeds, 3 tbsp of fennel seeds, 2 tbsp of coriander seeds, 1 tbsp black pepper, ½ tsp of carom seeds, and ¼ tsp asafetida in it one by one to dry roast them.
Stir the ingredients for 3 to 4 minutes to ensure an even roasting until the color of the spices changes to golden brown and you can smell the aroma.
Transfer the roasted spices onto a plate to end the cooking process. Set it aside to cool off.
Now, transfer the spices into your grinder.
Add 1 tbsp of black salt.
Also add 1 tbsp of amchur powder. If you do not have it, you can alternatively add chaat masala to it.
Then add 1 tbsp of dry mint leaves (pudina) powder.
Finally, add a tablespoon of table salt to it.
Grind the spices well.
Now take a strainer and place it over a bowl.
Pour the powder into the strainer. Use a spoon to strain it and get a finer powder.
The coarser spices will be separated. You may put them into the grinder and grind them again or discard them if you want.
Your raita masala powder is ready to be used.