Break the cinnamon stick into 2-3 parts and then heat the pan on medium flame. Add all whole dry ingredients like coriander seeds, cumin seeds, black pepper, clove, broken cinnamon stick and mace.
Then roast all whole ingredients for 3-4 minutes on low flame.
Remove it into the plate and cool it down completely.
Once cool down add into the coffee blender or spice blender and blend it till it becomes fine powder. you need powerful blender to blend all these dry ingredients.
Add remaining powder ingredients into the blended mixture and blend it again till mix it properly.
Now sieve the blended mixture thru fine sieve. If there is some coarse mixture remain after sieve, then blend it again and follow the same process.
Homemade Tandoori Masala is ready for use.