Sources of seed oils in the burgers and fries at five guys: - Fries are fried in refined peanut oil - Buns contain vegetable shortening - Soybean oil in the mayo Besides that, the grill items can be made seed oil free by going bunless or asking for a lettuce wrap - no oil is used on the griddle to cook the patties or veggies according to the restaurant I called. Go to fiveguys.com/menu and click on the "Nutrition and Allergen Information" to see all ingredients