Pop your kernels in a popcorn maker or on the stove.
Add the turmeric, cayenne, and salt per taste directly to the popcorn once it's popped, and roughly mix.
In a large & sturdy pot, add the oil and turn heat on medium.
Once oil is hot, add the mustard seeds and cumin seeds.
When they stop sizzling, turn heat to low and add in your popcorn.
Starting mixing it as soon as the popcorn is added so that none of the spices burn on the bottom of the pan. Keep mixing for at least 5 minutes until all of the popcorn is nice and coated by the spices.
After 5 minutes are up, add in the butter, and black pepper per taste.
Turn heat back up to medium so the popcorn gets crunchier and continue to mix until everything is coated in butter.
Eat once it's done or cool completely before storing in a container!