Wikipedia
Lontong is a dish made of compressed rice cake in the form of a cylinder wrapped inside a banana leaf, commonly found in Indonesia; also in Malaysia and Singapore. The rice rolled inside banana leaf and boiled, then cut into small cakes as staple food replacement of steamed rice. The texture is similar to those of ketupat, with the difference that ketupat container was made from weaved janur (young coconut leaf) fronds, while lontong uses banana leaf instead.
It is commonly called nasi himpit (lit. "pressed rice") in Malaysia, despite actually having different method to create it.
Arem-arem is the smaller size of lontong filled with vegetables ( carrot, common bean and potato) sometimes also filled with meat, are eaten as snack.
The dish is usually served cold or at room temperature with peanut sauce-based dishes such as gado-gado, karedok, ketoprak, other traditional salads, and satay. It can be eaten as an accompaniment to coconut milk-based soups, such as soto, gulai and curries. It is also used as an alternative to vermicelli noodles.