Heat a medium-sized pan, preferably cast-iron, on low to medium heat. The heat must remain on low to medium because the spices can easily scorch and turn bitter or burn.
Once the pan is hot, add coriander seeds, cumin seeds, fennel seeds, fenugreek seeds and cinnamon bark and gently stir until the mix becomes aromatic, about 1 minute.
Next add red chilies and curry leaves and gently stir for about 1 or 2 more minutes until you can smell the beautiful fragrance of curry leaves.
Add turmeric powder, give it a quick stir. Immediately remove from heat and allow to cool completely.
Grind the cooled spices in a spice or coffee grinder.
Transfer and store in an airtight container, preferably glass, and keep in a cool, dark place. This will keep for several weeks or even months.