san francisco boudin bakery sourdough english muffins boudin sourdough a great day begins with a great breakfast. our new “rustic” sourdough english muffins are made extra thick and able to stand up to any topping. they’re a wonderful way to start the day.another great product brought to you from san francisco’s boudin bakery that has been in existence since 1849 serving the entire san francisco bay area is now available for you as well.