Photo 1: Tonsom/Nonsoom Bambangan

                                     Source: Obsidian Soul

Tonsom Bambangan, also known as Nonsom Bambangan, is one of the iconic traditional dishes of the Kadazandusun community in Sabah, Malaysia. It is made using the bambangan fruit, scientifically known as Mangifera pajang, a type of wild mango from the same family as the common mango and kuini. Compared to regular mangoes, bambangan has a distinctly sour flavour and a strong, unique aroma. The fruit is characterised by its thick skin, fibrous texture, and rich nutritional content, including vitamin C, antioxidants, and dietary fibre that support digestive health and boost the immune system.

                               Photo 2: Bambangan Fruit

                                   Source: Obsidian Soul

The term “tonsom” or “nonsom” is derived from the Kadazandusun language and refers to the process of fermentation or pickling, a traditional method of preserving food using natural ingredients such as salt. As such, Tonsom Bambangan falls within the category of fermented culinary heritage, with the primary purpose of extending the shelf life of the fruit so it can be consumed over a longer period. This practice reflects the traditional lifestyle of the Kadazandusun people, who placed great importance on preserving food, especially during times when access to fresh produce was limited.

This technique has been passed down through generations, particularly among rural communities in Sabah, long before the advent of modern refrigeration. The enduring use of this method in cooking demonstrates the wisdom and adaptability of local communities in utilising forest resources to create food that is not only nutritious and practical but also well-suited to their natural environment.