The Spice Lab India Black Salt-Kala Namak (Coarse) Sulfur Mineral Salt, 1-Count Package
This condiments is used in india and is used extensively in indian cuisine as a condiment or added to chaats, chutneys, all kinds of fruits, raitas and many other savory indian snacks.   Chaat masala, an indian spice blend, is dependent upon black salt for its characteristic sulfurous hard-boiled egg aroma.   Non-indians who are not accustomed to black salt often describe the smell as similar to boiled eggs