Start by measuring the spices. Run your fingers through spices like coriander seeds and cumin seeds to make sure that they are clean and there are no small stones or debris etc.
Since the whole spices differ in shape and size, we are not going to roast them together. Roast similar sized spices together.
On low heat, dry roast the coriander seeds and shahi jeera. Don’t brown too much. We are looking for a light toast. Transfer to a dry, clean plate.
Add the mace twigs, nutmeg pieces, black cinnamom pods and broken cinnamon sticks next. Roast gently for a minute or so. Transfer to the same plate.
Then, roast the green cardamom pods, black peppercorns and cloves together. Transfer to the plate.
Let all the spices cool down completely.
Add the cooled spices along with rose petals to a small blender jar. I use a dedicated coffee grinder for making spice blends.
Blitz 2-4 times and then pulse to make a powder. Don't over blend else the spices will release their oils and masala might become clumpy. The powder should not be too coarse, nor it should be super fine.
Open the lid. Using a dry spoon, transfer the biryani masala powder to a clean and dry air tight container and store for 1-2 months. Always use a dry spoon to scoop it out and secure the lid tightly to maintain freshness.