i think ken wants the DIY version. Basically it is a sweet and sour sauce with chilli. you can google for S+S sauces, and simply add chopped/minced green/red chilli to the recipe, but my basic recipe is tom puree, sugar, rice wine vinegar (or standard vinegar), bit of ginger, tablespoon of soy. The quantities of tomatoes, sugar and vinegar are not given as it's down to how sweet or how sour you want but start with a couple talespoons of each (plus 2-3 tablespoons water) - just keep adding bits of each until you're happy, the tom puree will help get the right consistency. To make the sweet chilli add chopped or minced fresh green/red chilli - again to your own preference.