Warm the water and butter until the mixture feels comfortably warm to the touch - 45-60 seconds in the microwave.
Whisk in the egg, salt, brown sugar and yeast.
Measure half of the flour into a large mixing bowl. Add the liquid ingredients and stir until combined. Stir in the rest of the flour until the dough comes together.
Turn the dough out unto a floured surface and kneed for 5 minutes until the dough becomes smooth and elastic.
Form the dough into a ball and put in a large, lightly oiled mixing bowl. Cover the dough with a wet tea towel or plastic wrap.
Let the dough rise until doubled in size - about 30 minutes. (I suggest turning the oven on to 350 F for one minute and then TURNING if off before putting the bread dough in it to rise.)
Proceed to the next stage of making the filling.