It is permissible L’chatchila (initially), and there is no prohibition of Threshing (Disha) involved.

The Eglei Tal defines the prohibition of Threshing as applying only to an act that is not characteristic of the normal way of eating; in such a case, the act of separation is viewed as a “completion of work,” which is the essence of Threshing.

However, regarding a fruit where the normal practice before eating is to remove its leaves or stem, this is permitted—provided it does not involve the prohibition of Sorting (Borer), such as a situation where there is a mixture of “food” and “waste.” In this case, each part is distinct and recognizable on its own. Therefore, we permit cracking the shell of a nut, as this is the standard way of eating it—bringing it to the table while in its shell and cracking it during the course of the meal.