Pickle a food item, and keep it for 40 days because that’s how long a grudge should last. On the 40th day, you have to throw it away to remove the grudge.
The belief is that the pickle withers and dies in place of the relationship between the people involved, so that the grudge would not poison their connection.
LB mentioned this as an extreme of grudge-holding among her people when she jokingly told me she would hold a grudge toward me and strike when my guard was down. While she was joking about her grudge, she used this story as an example of how I should beware around her, because her people (Armenians) are supposedly infamous for holding out grudges for extreme measures of time.
LB first heard this from a friend of hers who was carrying out this practice at the time, over a perceived snub from a close friend. Because she could not act out toward the friend as they saw the wronging unevenly, and their long-term relationship is more important to her than the perceived wrong. She placed a cucumber in a jar of vinegar for 40 days, and on the 40th, the jar should be broken to release the resentment. The cucumber is used as a sacrifice in place of an important relationship.
LB’s friend’s jar actually never made it to day 40, as it broke on its own on day 35. While it was a mess to clean up, LB’s friend took it as a sign that the grudge had run its course before the time was even up.