Combine durian flesh and coconut milk together in a blender and process until smooth. Strain and discard the impurities. Add sugar, agar-agar powder, salt and colouring then bring to a boil. Cook until agar-agar and sugar are completely dissolved.
Bring mixture away from the heat and add in milk and mix well. Leave aside for two to three minutes to cool slightly.
Rinse well patty tins and pour in agar-agar mixture. Leave aside to set.
Remove the durian filling from the patty tins and cut out neatly with a 5cm (2in) round cutter.