What is Kasundi?
Kasundi is the Bengali rendition of mustard sauce, but comparing it to the mild yellow mustard on a hot dog is like comparing a house cat to a tiger. It is a potent, pungent paste made from fermented mustard seeds, traditionally a blend of black and yellow.
The fermentation process gives it a complex, tangy flavour and an intense sharpness that can clear the sinuses, much like wasabi. This isn't just a simple sauce; it's a revered culinary heirloom, historically known as the 'queen of pickles' in Bengal because, when stored correctly, it could remain edible for years.
A Taste of Tradition
Historically, making Kasundi was a highly ritualistic and exclusive affair. Its preparation was often reserved for elite households and followed strict rules, sometimes governed by caste and gender. The process would traditionally begin after the winter mustard harvest, often on the auspicious day of Akshaya Tritiya, linking the condiment to prosperity. Married women would perform ceremonial washing of the mustard seeds, but the final, crucial steps were often carried out by men, particularly Brahmins, highlighting its sacred status. While these rigid customs have softened over time, the reverence for authentic, homemade Kasundi remains.
The Art of the Make
The authentic preparation of Kasundi is a testament to patience. It begins with washing and drying mustard seeds, which are then ground into a paste with ingredients like green chillies, ginger, and garlic. This paste is then mixed with salt and sometimes a souring agent like raw green mango before being placed in sterilised jars—traditionally earthenware pots—to ferment. This slow fermentation, which can take days or even weeks, is what develops Kasundi's signature deep and complex flavour profile. Commercial versions are now widely available, but many aficionados argue they lack the nuanced character of the traditionally prepared relish.
Know Your Kasundi
Kasundi is not a monolith; several variations exist, each with its own unique profile. The most common is the plain 'Jhal Kasundi' (fiery kasundi), which delivers the purest, most pungent mustard kick. Perhaps the most popular version is 'Aam Kasundi', which incorporates raw green mango, lending it a delightful tangy and fruity edge that balances the sharpness. Other varieties include 'Tomato Kasundi', a sweeter, milder chutney, and 'Gota Kasundi', which includes a mix of powdered dry spices and fruits. Traditionally, some versions were used sparingly on greens, while others were developed to be used in cooking.
Beyond a Simple Dip
While traditionally served with stir-fried greens, modern usage has expanded dramatically. Today, Kasundi is the quintessential partner for Bengali fried snacks like 'telebhaja', fish cutlets, and samosas, where its sharp flavour cuts through the richness. But its versatility doesn't stop there. It serves as a fantastic marinade for fish and chicken, a zesty spread for sandwiches and burgers, and a vibrant addition to salad dressings. It can be mixed with mayonnaise for a milder dip or used straight from the jar to add an instant flavour boost to almost any dish.
