Sumlar refers to Cambodia's soup that is freshly prepared to order and cooked quickly. It is one of the two (2) kinds of soup that is featured in Khmer cuisine.
Other definition:
Sumlar is a Khmer word for "Soups". Sumlar is also spelled as "Somlar". It is also known simpley as "Sop".
In Cambodia, soup is served as an accompaniment to almost all meals, and is always served with the main dishes.