Wash and dry chillies very well to remove all dust and dirt. Remove and discard stalks. Chop chillies finely. Separate and peel garlic cloves. Chop garlic finely.
Combine chillies, garlic, sugar and salt in a large glass jar and loosely cover. Let jar stand at room temperature for 4–5 days. Stir jar once a day with a freshly-washed clean spoon. Mixture will bub