Seattle Sour Brioche Bun 6's Hamburger Buns 15.5oz Facebook. Twitter. Instagram. If you have any questions or comments about this product, please let us hear from you. Find us at the following locations: Online: Mail: Franz Customer Service PO Box 14769 Portland, OR 97293. Please include the name of the product, where you purchased it, and the UPC. For more info visit With rich flavor, subtle sweetness, and an irresistibly soft feel, these buns will take your burgers to the next level. Bring on the toppings - these buns will hold up to the toughest, messiest burgers you can create! Seattle Internatioal Brioche Buns have 0 grams trans-fat and no high fructose corn syrup or partially hydrogenated oils. Founded in 1906 by Englebert Franz, Franz Bakery continues the tradition of baking fresh breads for communities throughout the United States. Still a family owned bakery, Franz remains one of the largest independently owned and operated bakeries creating the finest breads, bagels, buns, English muffins, cookies, doughnuts and pastries in the nation.