In a bowl, mix milk, sugar and yeast, let stand to bloom for 5 mins
In a large bowl, mix flour and cocoa powder mixture
Pour in bloomed yeast into flour mixture, knead
Cover with cling wrap and let stand in warm area for 20 mins
Divide into 10 balls @75 g each
Roll flat each ball, fill with choc chips, shape into fishes
Preheat steamer, then work on the other 5 balls, fill with dark chocolate bars
Steam buns for 8-10 mins