Does this look like Snowskin Mooncake with  black tau sar?
Tau Huay (Soya Milk) Jelly Mooncakes
      Grass Jelly Filling
      250g Water
      3 1/2 tbsp Sugar
      1 tsp Agar agar powder
      2 Pandan leaves
      100g Grass Jelly - (unsweetened), cut to strips
      OR  use
      100g Grass Jelly - (sweetened), cut to strips - reduce sugar to 1 tbsp + 1 tsp  (about 20g)                
      
      Tau Huay (Soya Milk) Jelly
      500g Nutri Soy Soya Milk (reduced sugar)
      125g Fresh milk
      45g Sugar
      Methods:
- For making grass jelly filling - use a round plastic cup that is smaller than the jelly mould. (see picture)
- Boil water, sugar, agar agar powder and pandan leaves together in a pot at medium heat.
- Keep stirring mixture with a hand whisk until liquid boiled. Discard pandan leaves and off heat. Add grass jelly strips into it, stir well with a spoon for another minute.
- Pour grass jelly liquid into 12 plastic cups evenly and leave to set in fridge for about 15 minutes. 
- For Tau Huay (Soya Milk) Jelly - mix all ingredients in a pot, bring to boil at medium heat.
- Keep stirring during the process so that it will not be burnt. Off heat and stir for another minutes. 
- Pour some soya milk liquid into moulds till half full. Gently scratch set grass jelly filling with a sharp knife. This will make the agar agar jellies stick together.
- Place one piece of grass jelly filling in each mould, then fill up the mould with soya milk.
- Cool and chill jelly mooncakes to set in the refrigerator