I never knew lemon and potatoes go hand in hand. I would just say that lemons have its use and so does potato. But from this prompt, I checked online and I found out it has been in use for a very long time.
I got confused when I thought about mixing lemons with potatoes, that's quite a combination. I'll show you one of the things I saw online:
The unique thing about Greek Lemon Potatoes is that they are cooked in a heavily flavoured lemon garlic broth so they suck up all that flavour before roasting to golden perfection. They’re utterly addictive! Link
You can say it is a usual custom for the greeks.
Here's another one:
A lot of lemon potato recipes either coat the potatoes with lemon juice and roast them, or simply roast the potatoes with lemon wedges. Whilst this infuses the potatoes nicely, the excess moisture causes the potatoes to steam instead of roast, leaving them limp and soft. Link
I'm not really sure I would love to taste this combination.
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