Mustard seeds are readily available in Khari Baoli and Azadpur Mandi. Suppliers like Jain Traders and S.R. Spices stock yellow, brown, and black mustard seeds sourced from Rajasthan and Uttar Pradesh. These seeds are used for tempering, oil extraction, and pickling best spices manufacturer in delhi. Buyers should check for uniform size, dryness, and pungent aroma. Organic mustard seeds are available from brands like Organic Tattva. Bulk buyers can negotiate better pricing. Ensure proper packaging to prevent moisture exposure and verify FSSAI certification for food safety compliance.