Every Christmas, my informant’s family will hide a pickle ornament in the tree and whoever can find it first gets a jar of pickles as a prize. She said that this is how they also initiate people into the family. She remembered when her brother-in-law first came to the house for Christmas and he was very confused and thought that it was weird. She says people always get this look on their face when they walk in the door and are told “Ok, now find the Pickle!”
While typically this tradition is for children on Christmas morning, my informant’s family has changed this to a family tradition that helps the test people who are new to the family such as a potential spouse. The emphasis for this traction is on family ties and having a game that includes everyone, even the new comers. It’s an initiation ceremony.