It's Our #1 Seller For a Reason! [2] 3 oz Wagyu Smash Patties, Paper Thin Fried Onions, and Cooper Cheese on a Heidelberg Brioche Roll. Comes with a side of our House-made Dill Pickles. Resist your urges to add condiments to this burger, as it truly doesn't need anything! Keep in mind this advice is coming from people who typically love a burger with ketchup and mayo. While technically not Gluten Free, many of our Gluten Sensitive customers are able to enjoy our Heidelberg Brioche Rolls thanks to their long fermentation process and super clean ingredients.