Add everything (except the slurry) to a saucepan. Boil for 10 mins until the sugar dissolves and the sauce gains color.
Stir in the slurry and cook for 6-7 mins until glossy and slightly thickened. Let it cool.
Adjust sweetness or heat by tweaking sugar or chili flakes.
For the best flavor, let it rest in the fridge for 24 hours - the vinegary taste mellows overnight.
Store in a bottle in your fridge for up to a month. Serve with your favorite snacks (spring rolls for me).
