Mustard seeds are the small round seeds of various mustard plants.
Rai (Mustard seeds) are the small round seeds of various mustard plants. The seeds are usually about 1 to 2 millimeters (0.039 to 0.079 in) in diameter and may be colored from yellowish white to black. They are an important spice in many regional foods and may come from one of three different plants: black mustard, brown Indian mustard, or white/yellow mustard.
Grinding and mixing the seeds with water, vinegar or other liquids creates the yellow condiment known as prepared mustard.
Rai Kuria, also known as Rai dal is mustard seeds with the skin removed, then roughly grounded. Rai Kuria is the main ingredient in making pickles. It is RaiKuria that gives pickles the special tangy taste that makes Indian pickles famous throughout the world. Rai Kuria is the life and soul of mango pickle, without it, it would be incomplete.