1 lemon, zest only
500g/1lb 2oz chopped rhubarb
70g/2½oz tapioca pearls
250g/9oz light soft brown sugar
4â5 tbsp light brown sugar
4â5 cardamom pods, seeds removed and finely ground
3 tbsp fine desiccated coconut
2 tbsp finely ground pistachios (or any other nuts of choice)
2 tsp rosewater
1 tsp vanilla extract
500ml/18fl oz full-fat milk