I remember, years back, when Domino's said the favoring topping in Japan was corn and potatoes.
Just looked it up and apparently it is still popular.
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Chiyo-san, who is Japanese, topped her pizza with potatoes and corn.
These are standard toppings in Japan, but her American husband burst out laughing when he saw them!
Putting potatoes and corn, which are carbohydrates, on top of pizza dough, which is also carbohydrates, might seem odd to those who aren't used to Japanese pizzas, but this doesn't seem to be an issue in Japan where things like
Yakisoba pan and potato croquette sandwiches are commonplace, not to mention eating rice with ramen or gyoza dumplings.
Other toppings you usually wouldn't see on a pizza in the US are mayonnaise, tuna, mentaiko (spicy seasoned cod roe), and strips of nori seaweed."