4 (about 100g3.5oz) long red chillies
3 (about 10g/0.35oz) red birds’ eye chilli
6 garlic cloves (about 30g/1oz) garlic, peeled
100g white sugar
15ml white vinegar
15ml fish sauce
4g (0.14oz) salt
5g (0.17oz) potato starch or cornstarch mixed with 5g (0.17oz) water
Place chillies and garlic in a food processor and pulse until roughly chopped.
In a large saucepan over medium-high heat, combine the water, sugar, vinegar, fish sauce and salt. Add the chilli and garlic mixture and simmer until sugar dissolves. Then turn heat down and simmer for 5 minutes to let the flavours develop.
Whisk in the potato starch mixture and gently simmer for another minute.
Allow to cool, then store in a glass jar in the refrigerator for up to 3 weeks.