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[Icicle]

this kind of push cart restaurant is so cool! i wonder if selling singaporean food in japan from a push cart can make money...like bak chor mee, roti prata or even satay.

Like others have mentioned, I think roti prata can sell decently! 
Moreover, the Japanese already love curry. Although their curry is different from the fishy curry we use for roti prata, I think they'll enjoy it too. 
And it's possible to pair prata with Japanese-style curry too! Actually that sounds like a nice idea for me to try.

Satay is possible too. The sight and smell of grilling meat is always attractive.