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You are right, apam comes from India, here apam more made in Pidië, which is one of the densely populated by the descendants of India. And there are Indian specialties that are often made in Aceh and also include traditional foods such as Kanji and Cané.

I knew that they are mostly made in South India, especially in the state of Kerala.

yes.
Because the people of Aceh are of Indian descent, so traditional Indian food is also a traditional Aceh food, especially Indian descent.