Salt flavor in long-term stews often diminishes over time as it interacts with other ingredients and its perception changes due to the overall flavor profile becoming more complex. You may need to add more salt towards the end of the cooking process.
When you initially add salt to a stew, it seasons the individual components and enhances their inherent flavors. However, as the stew simmers for an extended period, several factors contribute to the perceived reduction in saltiness. First, the salt ions diffuse throughout the entire stew, becoming less concentrated in any one area. Second, the flavors of the other ingredients meld and deepen, creating a more complex and nuanced flavor profile. This complexity can mask the saltiness, making it less prominent. Third, some of the salt may react chemically with other ingredients, further altering its flavor. Finally, our taste buds can become desensitized to a constant level of saltiness over time. Therefore, it's crucial to taste the stew periodically throughout the cooking process and adjust the seasoning accordingly, especially towards the end.
Always add salt gradually and taste frequently. It's easier to add more salt than to remove it. Consider using a high-quality sea salt or kosher salt, as they often provide a cleaner, more nuanced flavor compared to iodized table salt.