- In a small bowl, combine warm water, sugar, and yeast. Stir gently and let sit until foamy, about 5 minutes, to activate the yeast. 
- In a large mixing bowl, whisk together the flour and salt to evenly distribute. 
- Add the pumpkin puree, melted butter, activated yeast mixture, and orange zest to the dry ingredients. 
- Mix everything together with a wooden spoon or dough scraper until a shaggy dough forms. 
- Transfer the dough onto a lightly floured surface and knead for about 8-10 minutes until smooth, elastic, and slightly tacky. 
- Shape the dough into a ball and place it in a greased bowl. Cover it with a kitchen towel or plastic wrap and let rise in a warm spot until doubled in size, approximately 1 to 1.5 hours. 
- Once doubled, punch down the dough gently to release excess gas, then transfer it onto a floured surface and shape it into a loaf. 
- Place the shaped dough into a greased loaf pan. Cover again and let it rise for another 30-45 minutes until puffed and nearly doubled. 
- Preheat your oven to 350°F (175°C). 
- Bake the bread for about 40 minutes, until the crust is golden brown and the loaf sounds hollow when tapped. 
- Remove the bread from the oven, transfer to a wire rack, and let cool for at least 15 minutes before slicing to allow the crumb to set. 
- Slice and enjoy this warm, moist pumpkin citrus bread with butter or your favorite spread.