Wash the pumpkin thoroughly and remove the skin and seeds.
Steam the pumpkin and mash the flesh.
Add bread flour, sugar, salt, yeast, and milk to the mashed pumpkin and knead.
Add butter and knead until the dough becomes smooth.
Let the dough rise for the first fermentation.
Shape the dough into a ball and allow it to rise a second time.
Bake in a preheated oven at 180°C (356°F) for 15 minutes.
Let cool and finish.