Mustard seed chutney turns bitter primarily due to over-roasting the mustard seeds or using too many mustard seeds in proportion to other ingredients. The bitterness is released when the seeds are heated excessively.
The characteristic pungent flavor of mustard seeds comes from compounds called glucosinolates. When these compounds are exposed to heat, they break down and can release a bitter taste, especially if the heat is too high or prolonged. Several factors contribute to bitterness in mustard seed chutney:
Over-Roasting: Roasting mustard seeds enhances their flavor, but overdoing it releases excessive bitterness. The seeds should be lightly toasted until they just start to pop and become fragrant, not browned or burnt.
Excessive Quantity: Using too many mustard seeds in relation to other ingredients like sweeteners (sugar, jaggery) or souring agents (lemon juice, vinegar) can overwhelm the chutney with bitterness. Balance is key.
Seed Quality: Older or improperly stored mustard seeds can develop a more pronounced bitter flavor. Use fresh, high-quality seeds for the best results.
Lack of Balancing Flavors: A well-balanced chutney incorporates sweet, sour, and spicy elements to complement the mustard seeds. Insufficient sweetness or acidity can make the bitterness more noticeable.
To reduce bitterness, soak the mustard seeds in warm water for 15-20 minutes before roasting. This helps to leach out some of the bitter compounds. Remember to drain them thoroughly before roasting.