No, there is no hard-and-fast rule that it has to be served as a dessert - it was the very popular Kayu chain which popularised this dish, where the roti tisu is lightly coated with sweetened, condensed milk. It appeals more to the non-Indian, mostly Chinese, diners who made up 60%-70% of their client base. At Kayu’s main branch in PJ SS2, they sell 200 of these each evening! Other eateries soon joined in the fray with copycat sweet roti tisu.
But I guess not everyone goes for sweet roti tisu, so savory options are now offered.
