I usually use 1/4-1/2 teaspoon of kala namak. This is the most important ingredient since it gives it its egg-like flavor, you can order it online and/or find it at health food stores. Alternatives: use kelp flakes, old bay seasoning or shredded nori to make it taste like tuna/fish instead OR omit if you don’t have either and use a little smoked paprika.