Amchar masala is an Indian spice mixture. There are many family recipes but this version includes coriander, black peppercorns, fennel seed, brown mustard seed and fenugreek seed.
Put all the spices in a small, cast-iron frying pan and set over medium heat. Stir and roast for 1 to 2 minutes, or until the spices turn a shade darker.
Remove from the pan, allow to cool, and then grind as a finely as possible in a clean coffee or spice grinder.
Empty into an airtight jar and store in a dark cupboard or pantry.