Put all the ingredients for the buns apart from the water and sesame oil into a bowl and roughly combine. Pour half the warm water into the dry ingredients and stir. Pour in the remaining water and mix well. Dust a clean surface with a little of the extra flour, and tip the dough onto it. Knead with your hands for five minutes. Once kneaded, if possible try to shape your dough into a rough 'bun'.
Rub the inside of a large bowl with the sesame oil. Put in your dough, cover with cling film or a clean tea towel, place in a warm place and leave to prove until the dough has at least doubled in size. This normally takes a minimum of 90 minutes.
Tip the dough onto a floured surface and knead again to knock out the air. Take a golf-ball sized piece of dough and flatten with the palm of your hand. Spoon at least one and a half teaspoons of the red bean paste into the middle of the flattened pastry. Carefully pull up the edges of the dough to encase the filling in a ball shape, and then smooth the edges and place on a floured tray.
Repeat the process with the remaining dough and filling, then cover the buns with a damp tea towel and leave to rise for another 15 minutes. Once raised, place each one on a small disc of baking parchment with the join underneath. Top each bun with two goji berries. Place in a steamer and cook for 12-15 minutes. Once cooked serve immediately and there you have it your very own Chinese Red Bean Bao!
Recipe given by Gok Wan.
This recipe appears in the Celebrity Bake Book, in aid of the Ben Kinsella Trust.