½ cucumber
1 tbsp finely chopped fresh coriander
2 soft lettuce leaves, roughly chopped, or small handful rocket
½ lime, juice only
1 spring onion, sliced
½–1 tsp chilli jam or Thai chilli sauce, to taste
½ tbsp mayonnaise
salt and freshly ground black pepper (optional)
1 tbsp caster sugar
splash Thai fish sauce or soy sauce
1 tbsp rice vinegar (or half cider vinegar, half water)
salt
½ tbsp full-fat plain yoghurt
50g/1¾oz cooked tiger prawns
1 slice bread, such as ciabatta or sourdough, buttered