Roast all ingredients separately in medium heat till golden brown. Medium heat is important to make sure even roasting.
Roast curry leaves till dry. There shouldn't be any moisture left. To make if there is moisture, crumble leaves. They should make crunchy noise and fall apart.
Let them cool.
Grind them to a powder.
Recipe by Ujwala's Delicacies at https://www.ujwalasdelicacies.com/multipurpose-vegan-gluten-free-spice-powder/