The raw shell of chestnuts is rather tough, making the peeling process a challenge. Soaking them in salty water softens the inner surface of the shell, facilitating easier removal. This method, especially when the shells have been pre-scored, significantly accelerates the peeling process.
It Influences the Flavor Too
The slightly bitter taste naturally present in some chestnuts is substantially reduced thanks to the salty water. As the bitter components seep into the water, the chestnut's unique sweet and balanced flavor becomes more pronounced. Therefore, it's a preferred preparation method especially for roasting and dessert recipes.
Moreover...
Chestnuts, due to their structure, are susceptible to insect infestation. Soaking them in salty water slows down the growth of any microorganisms that may be present on the shell or within the tissue, thus reducing the risk of infestation. This allows the chestnuts to stay fresh for a longer period.
As the chestnuts absorb water while soaking, they start to soften, which noticeably shortens the cooking time. They cook more evenly in the oven, the inside softens more uniformly when boiled, and the likelihood of the shell cracking excessively is reduced. As a result, both the texture and overall cooking quality are enhanced.