Lose the middle vein in your kaffir lime leaves and using a pair of scissors, snip them straight into the mortar.
4 kaffir lime leaves
Add the salt and sugar to the mortar and grind away (round and round) until you get a fine paste.
1 tsp salt, pinch white sugar
Stir in the lime juice and store, covered, in the fridge. While you can eat it immediately, it's best enjoyed at least a day after.Will keep in the fridge for a month, but there's so little of it, you'd be wishing you'd made more!