Mash 2/3 cup pumpkin. Dice remaining pumpkin and set aside. Place flour and salt into a large bowl. Add butter and using fingertips, rub butter into flour until mixture resembles breadcrumbs. Add mashed pumpkin, fetta and chopped rosemary and stir to combine. Make a well in centre. Add buttermilk. Using a flat bladed knife, stir until a dough forms.