Chestnut and Shitake Mushroom Steamed Wontons

My wife was recently given a Spirit House cookbook for her birthday. I have heard many good things about this place and judging by the quality of the cook book, it is clearly worthy of the hype. I asked my wife to choose a starter and she chose this. Not having all of the ingredients I altered it sufficiently to consider place it here. They were slightly fiddly but really worth it.

500 gms pork mince
10 water chestnuts chopped
1 tbs fish sauce
2 tsp soy sauce
1 tbs chopped coriander
1 tbs chopped basil
1 handful dried shitake mushrooms reconstituted and chopped
1 egg
1 packet wontons

Combine all of the ingredients except for the wontons. Spoon about 1 tsp of pork mixture into the middle of each wonton, wet the edges and seal. Half I sealed in a rectangle, half I sealed on a diagonal and folded like tortellini. Steam for 8-10 minutes. You can separate layers with grease proof paper cut into rounds and holes cut into it. I served this with kecap manis and sriracha - a Thai hot chilli sauce - it is amazing.