Peel and coarsely chop the ginger and garlic. Wash and clean the chilli, remove the seeds. Coarsely chop the pod. Tomatoes wash, clean and chop coarsely. Puree finely in a blender
Bring the tomato puree, sugar, vinegar and fish sauce to the boil and simmer for approx. 30 minutes, stirring occasionally, until the jam is reduced by about half
Immediately fill into clean, tightly sealed jars. Place glasses upside down for approx. 5 minutes