Created by expert bakers with a 36 hour sourdough starter for a fantastic flavour, topped with semolina & flour for an authentic crust This delicious Cob has been crafted by our Expert Bakers using a traditional 36 Hour Starter Dough. Vitamin D & Fibre Look for our bread & rolls that are a natural source of vitamin D and fibre. There are few dietary sources of vitamin D, so our bread is made with yeast that naturally produces it. Vitamin D contributes to the maintenance of normal bones and teeth.