Laksa is a dish of Peranakan origin, with a variety of ingredients and preparation processes that vary greatly by region. Because laksa has different varieties across the region, it is difficult to pinpoint the exact origin of the dish. Nevertheless, numbers of laksa recipes has been developed along the trade channels of Southeast Asia—where the ports of Singapore, Penang, Medan, Malacca, Palembang, and Batavia (now Jakarta) are the major stops along the historic spice route. The intensive trade links among these port cities enables exchanges of ideas to take place, including sharing recipes.
A wide variety of laksa exists in Southeast Asia, with regional and vendor-specific differences. Laksa can be broadly categorized by its two main ingredients: noodles and soup. Most preparations of laksa are garnished with herbs. Two of the most widely used herbs are mint and Vietnamese coriander, known in Malay as daun kesum or by its colloquial name daun laksa "laksa leaf". Another popular garnish used for many laksa recipes is the unopened flower bud of the torch ginger, usually sliced or shredded.