In a small saucepan, heat ¾ cups of milk until it starts to bubble and then immediately remove it from the heat and let it's temperature drop down to 105°.
In a large mixing bowl, stir together the yeast, half the sugar, and a quarter of a cup of 100 degree water. Let this sit 5 minutes.
When the milk reaches 105 degrees, add it to the mixing bowl with the rest of the sugar, the salt, and the butter. Stir for one minute.
Stir in ¾ cup flour (90g) and stir for one minute.
Add another ¾ cup of flour and stir for one minute.
Slowly add 1 more cup of flour (120g) and stir for one minute.
Knead 10 minutes on a well floured board.
Oil a large clean bowl and let the dough rise, covered with plastic wrap, in a warm place for one hour.
Shape the dough into a 12 inch snake and cut into 12 pieces. Roll each piece into a ball and place on a floured parchment paper lined baking sheet. Put it in a warm place, cover loosely with plastic wrap and let rise for 30 minutes.
Cut 12 3 by 6 inch pieces of parchment paper. Heat a bamboo steamer over a Dutch oven with 2 inches of simmering water.
On a floured board, roll each dough ball into a 6 inch long oval. Using a pastry brush , paint the dough top with oil, and then place it on a piece of parchment paper, and fold it gently in half.
In several batches, steam the buns on lettuce leaves for 20 minutes, or until puffy and cooked through.