Wikipedia
Arem-arem is an Indonesian Javanese snack made of compressed rice cake in the form of a cylinder wrapped inside a banana leaf, filled with diced vegetables, tempeh or oncom, sometimes also filled with minced meat or abon ( beef floss), and eaten as snack. Arem-arem is often described as a smaller size lontong snack with fillings, thus sometimes also called lontong isi (lit. "filled lontong").
It is a common snack in Java, and commonly found in Indonesian marketplaces as jajan pasar ("market munchies") as a type of kue (snack) offered there. Arem-arem is often served as traditional ceremony, family gathering, birthday, office meetings, and often presented in a snack box. It is quite similar to lemper, but use common rice instead of sticky rice lemper.