I believe that with chilli sauce, you need the correct balance of all of the ingredients: too much sugar, and it’s all syrupy; too much chilli, and suddenly it becomes overpowering. But get the ingredient proportions correct, then you’re going to have a stronger and more satisfying taste. The sultanas are perfect because they provide a natural sweetness to the sauce which could only have been achieved by adding extra sugar (thus making it more syrupy). It’s a WIN-WIN really!
