50mlrice wine vinegarif you don't have this use just red wine vinegar.
Instructions
Begin with sterilising the jam jars or bottles in the dishwasher of place in the oven on a baking tray heated to 100°C.Now finely chopping half the quantity of tomatoes. Roughly chop the remaining tomatoes and place in a food processor with the garlic, chillies, ginger and fish sauce. Blend until it’s a puree.
Pour the puree into a heavy-based saucepan with the sugar and vinegar. Bring to a slow boil, on a medium to low heat, stirring occasionally.
Once it has reached boiling point, reduce to a simmer and cook for 10 minutes before adding the chopped tomatoes. Stir and continue to simmer until it reaches a jam like consistency. (this can take 25-30 minutes). Skim any scum that formed with a metal spoon or ladle. It’s important to stir it from time to time to make sure it’s not catching at the base of the pan.
Pour the mixture into sterilised jars. Seal while still hot. Serving suggestions: with cheese, fish cakes or chicken.
Store in the fridge once opened and consume within 10 days.