Toast salt over medium low heat until hot (may turn slightly gray). Remove to blender or food processor.
Add sesame seeds to pan, and toast over medium low heat (use a fairly wide pan so the seeds are in a shallow layer). Stir frequently. If seeds starting popping, remove pan from heat and stir constantly to avoid burning. If not quite toasted enough, return to pan and continue stirring. Seeds should be golden brown and fragrant when done. (This should take 4 - 5 minutes.)
Add seeds and nutritional yeast to blender or food processor, and pulse until coarsely ground (roughly 5 times in my high speed blender). Don't blend to a fine powder, you want to leave a little bit of texture.
Store gomasio in refrigerator in a sealed jar, and use on stir-fries, avocado toast, popcorn, or pasta (as a parmesan replacement).