According to their Allergen and Preparation Guide all of their food that is fried beef shortening is used exclusively and NOT vegetable oil. I was amazed when I found out originally from a co-worker who used to work at one and happened to mention it to me. I think she thought it was a bad thing of course as most people who are not Peat followers would naturally believe from all the vegetable oil propaganda out there. This chain has well over 1,000 locations worldwide and they fry all their fries (also potato chips and wedges), onion rings, and even homemade nacho chips in the tallow. Of course there is still plenty of PUFAs hidden in other ingredients like mayo based sauces, but I still thought it was a great find. My wife and I tried a couple of their Burgers without the added sauce/dressing and we thought they were amazing (one with deep fried Wisconsin cheese curds and the other with real Blue Cheese) with a sides of wedges and chips (really lattice type French fries). You can also get fat free powdered seasoning on any type of fries like lemon pepper, salt and vinegar, buffalo, etc.