make tang-zhong
proof for 1 hour
divide into 20 parts, ball up rest 30 mins roll into a sheet, flip , use wide side as bottom to roll up --- no need to roll anymore lay out in 13' tray (34 cm * 25 cm)
bake at 180C/ 356F for 30 mins - (she thinks her 374F/190C is better, color is darker) mine is dark enough, bottom is a tad crusted but still taste good