In a large bowl, dissolve yeast in water. Add some sugar to feed the yeast. Mix together the plain flour and yeast water, and knead the dough well for 2 to 3 minutes. Cover with cling film and set aside for 30 minutes.
After 30 minutes, knead the dough again, you should notice it becomes slightly softer comparing to before resting. Cover with cling film and set aside for another 90 minutes.
Now you can take a break or work on the filling right a way. Mix together your chopped vegetables, minced beef, sesame oil, soy sauce and a pinch of salt and all other spices. I used a food processor here her it should work just fine without one.
Once more, dust your work surface with a small amount of flour to prevent the dough from sticking. Next, pick up the dough and pock through a hole in the centre, then runt the dough with your hands to make a donut shape. This makes it easy to separate the dough in to equal sized pieces. Flatten each one of your dough balls and place some filling in the centre. Gather the dough at the top and pinch the top a couple of times to close your meat bun!
Once done, let them rest for another hour before steaming.
Steam for 20 minutes and let rest for 5 minutes (without removing the lid) and its done! You should steam all the buns you made. Save them in the fridge if you couldn't finish them in one go. Next time, steam it for 5 minutes to heat it up, and it should be ready to serve.
