I imagine there is, but one of my top uses for leftover spaghetti is tossing it into a frittata, ideally with some leftover broccoli and topped with cheese.
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Most Canadian potato salad looks and tastes like most American potato salad.
I don’t like surprise mustard in potato salad or salad dressings. A lot of people add mustard to their potato salad in Canada, too.
I have had Japanese potato salad before. 
I have made quite a few regional variations on potato salad.
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Yes, I remember your dislike of mustard on sandwiches where you didn’t expect it. I very much understand that because there are certain condiments, spices or herbs that I had better be advised of beforehand or I’m going to be an unhappy customer.
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I figured some region in the States had to have a Potato Salad Sandwich.
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I was just talking to someone about Mi Goring sandwiches:
I guess this goes on an Australia food wish list though.
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“Stealth mustard” 
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Weird 
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Adding these 2 for a Chicago trip, some day. Thanks @BoneAppetite
Tommy’s in Coventry, Ohio has some unusual sandwiches.
It’s Americanized Lebanese food. I wish I knew about Tommy’s the last time I was in Cleveland for a wedding.
“For years, I laughed at the concept of potato salad squeezed between slices of white bread. Until recently, when I found this Potato Salad Bun offered at many Taiwanese bakeries (What’s that? The most well-known is the Sheng Kee chain found in many metropolitan areas with a large Asian population).”
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I had read about this idea that a potato salad sandwich is rare or unusual somewhere else recently.
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What struck my mind I’d that I have seen Russian Salad used as a sandwich filling in various cultures, and I’ve also seen lots of Indian potato sandwiches.
I think the potato salad sandwich is more universal than some food writers realize!
I would try a potato salad bun.
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I am generally a fan of the potato-wrapped-in-dough. Knish, pierog, this.
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And potatoes in tacos are a staple of Mexican cooking. Yum.
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Samosas! Yum.
We’ve yet to find a chip butty anywhere American slinging fish and chips. Maybe next time across the Pond . . .
(And we’re not about to resort to DIY in spite of well-intentioned instruction:)
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I find it highly unlikely you’ll find one except at specifically Anglo/Oz/NZ-centric places. It was a completely new concept to me when I lived in NZ for a year. They are virtually unknown in this side of whatever pond is applicable.
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Our Highlands expert calls it “Depression food”. No matter – like the potato salad bun, it makes total sense: ennobling the seemingly ordinary into the lastingly memorable.
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Our Welsh buddy was waxing poetic about them during his visit. They hold absolutely zero appeal to me, even as drunk food. But then I feel similar about other popular sammiches 
