Assam laksa is a sour fish-based soup. Asam is the Malay word for sour, but it is often used as an abbreviation for asam jawa or tamarind, which is commonly used to give the stock its sour flavor. Modern Malay spelling is asam, though the spelling assam is still freuently used.
The main ingredients for assam laksa include shredded fish, normally kembung fish or mackerel, and finely sliced vegetables including cucumber, onions, red chillis, pineapple, lettuce, mint and pink bunga kantan (ginger buds). Assam laksa is normally served with either thick rice noodles or thin rice noodles (vermicelli).
Penang laksa, also known as assam laksa from the Malay for tamarind, comes from the Malaysian island of Penang. It is made with mackerel (ikan kembung) soup and its main distinguishing feature is the assam or tamarind which gives the soup a sour taste. The fish is poached and then flaked. Other ingredients that give Penang laksa its distinctive flavour include lemongrass, galangal (lengkuas) and chilli. Typical garnishes include mint, pineapple slices, thinly sliced onion, hε-ko, a thick sweet prawn paste and use of lotus flower. This, and not 'curry mee' is the usual 'laksa' one gets in Penang.