In a large bowl or the bowl of your stand mixer, add the salt, then the flour (starting with 3½ cups), followed by the yeast
Note: salt can kill yeast so you don't want direct contact between the two until you start mixing
Whisk the egg with a ¼ cup of milk, then add the pumpkin puree, harissa paste and the oil. Mix together then add to the dry ingredients
Mix and knead until it forms a smooth dough. Around 8 - 10 minutes
Tip: if the dough is dry and doesn't come together, add a tablespoon of milk and mix to incorporate. Repeat with one tablespoon at a time until the dough is soft and smooth. If too wet, add a tablespoon of flour at a time until the dough can be handled and is less sticky. Do not over work the dough
Lightly grease a large bowl with a little oil and add the dough. Cover and place in a warm, draft free place for 45 minutes to 1 hour, until doubled in size
When the dough has doubled in size, turn it out onto a lightly floured surface. Cut the dough into 8 - 12 equal portions (the size and quantity will depend on the size of buns you want to make). Form each into a ball and place on a baking paper lined baking tray, leaving space in between for the buns to rise
Cover lightly with a clean tea towel and leave to rise for around 30 minutes, until they are around doubled in size
Preheat the oven to 190°C
When the buns have risen, bake for around 15 - 20 minutes, depending on the size of your buns. The buns should just start getting colour on top. Do not brown too much as you want to keep the vibrant orange colour
Transfer to a cooling rack to cool
Serve warm or cool with your favourite burgers and toppings