As a child, I also ate them for breakfast every time I spent the night at my grandparents' house. I'm in Houston now, and this afternoon I was talking to a neighbor from the town of West (which is a few hours northwest of here). My Czech grandparents lived an hour south of Houston but the neighbor and I both agreed on how much we like prune kolaches. I also love apricot. Some places use canned fruit which might taste fine to someone who doesn't know better, but it's a terrible clash with memories of what my grandmother made (and what some of my cousins still make), and I refuse to pay for them at any shop which does that. We also talked about the poppyseed ones, and how for us it's so heartwarmingly nostalgic but often other people who didn't grow up with poppyseed struggle to understand the appeal.