1 large handful fresh coriander, roughly chopped
1 spring onion, finely sliced
1-2 tbsp dried chilli flakes (to taste)
3 tbsp mayonnaise
1 tsp ground black pepper
pinch caster sugar
1-2 tbsp ground cumin (to taste)
2 tbsp groundnut oil
pinch sea salt
陆 tsp sea salt
1 tbsp light soy sauce
1 tsp wasabi paste (available from some supermarkets and Asian grocers)
400g/14oz beef fillet
1 tsp Shaoxing rice wine or dry sherry
warm flour tortilla wraps