1) Roast all the ingredients on a very low flame.
2) I have added all ingredients together and roasted, if you are scared that you will burn any of the spices, then roast all the spices separately one at a time and grind them together.
3) Store this in a air tight container.
4) If you are making a huge batch and you want to store it for longer time, then i suggest you to store them in fridge. Remove small amount of powder in a small container and keep in cupboard.