Dear, @erikah.
Even though you say this recipe is a hereditary recipe, it is now widely traded. But, for me, this is something new.
In my place, it is not customary to add prunes to the flour mixture. Every flour should always be dealing with something sweet. But, I will give it a try. It was so refreshing when the plum broke in my mouth, and that was the "enlightenment" of the taste I was about to receive.
Have a great day.
Every region, every country, every continent has its own culinary beauties but since the internet exists, there are no boundaries anymore. So everything is possible. We all learn and try out new things.