Start by toasting the fenugreek seeds in a dry skillet over medium heat. This step is crucial because toasting helps reduce the seeds' natural bitterness and brings out their nutty flavor.
Keep a close eye on the seeds, stirring constantly for about 3-4 minutes until they turn a light golden brown. Be careful not to burn them, as this can make the mixture bitter.
Once toasted, let them cool for a minute, then grind them into a fine powder using a spice grinder or mortar and pestle. Make sure the seeds are completely cool before grinding, as warm seeds can release oils that might clump.
In a small bowl, combine the ground fenugreek seeds, MSG, garlic powder, onion powder, and black salt. Stir the mixture thoroughly to ensure all the ingredients are evenly distributed.
Transfer your homemade asafoetida substitute to an airtight container. Store it in a cool, dry place away from direct sunlight. It should last for 2-3 months if stored properly.