Wash the pumpkin thoroughly, remove the skin and seeds, and cut it into small pieces.
Place the pumpkin in a steamer and steam for 20 minutes.
Mash the steamed pumpkin until smooth.
In a bowl, combine the mashed pumpkin, bread flour, dry yeast, salt, and sugar.
Add lukewarm milk and room-temperature butter, then knead the dough.
Cover the dough with plastic wrap and let it rise in a warm place for 1 hour.
Divide the dough into portions and place them on a pan.
Bake in a preheated oven at 180°C (356°F) for 25 minutes.