Sticky lamb buns with pickled cucumber relish

Name: Sticky lamb buns with pickled cucumber relish
Ingredients: ½ large cucumber; ½ red onion, finely chopped; 2 tbsp rice vinegar; 2 heaped tsp caster sugar; 1 tsp sesame oil; 1 tsp nigella seeds; handful dill, fronds finely chopped; 100g/3½oz pomegranate seeds; 600g/1lb 5oz roasted lamb shoulder meat, shredded (if cooking from scratch, refer to the recipe tip below); 2 tsp rose harissa; 6 tbsp clear honey; 1 heaped tsp ground cumin; 2 heaped tsp ground cinnamon; pinch sea salt flakes; 4 bread rolls, toasted just prior to serving (if desired), to serve