Mustard kernels, also known as Rai dal is mustard seeds with the skin removed, then roughly grounded. Mustard kernels are the main ingredient in making pickles. It is these kernels that give pickles the special tangy taste that makes Indian pickles famous throughout the world. Mustard kernels are the life and soul of mango pickle, without it, it would be incomplete.
The seeds prove to be a good source of omega–3 fatty acids, iron, manganese, zinc, protein, calcium, dietary fiber, and niacin.
Mustard seeds add an aromatic effect to the food when fried in oil.