<P> "Whole grilled onion" or "grilled onion" - onions are grilled until brown, placed on top of meat . </P> <P> In - N - Out uses the Kennebec variety of potato for its fries and prepares them on - site as opposed to purchasing them pre-made from other companies . The company's french fries are cooked in "100% pure, cholesterol - free sunflower oil ." Fries can also be cooked to order, with cooking times ranging from "light" to "extra well done". </P> <P> The company offers lemonade, iced tea, coffee, four flavors of milk shakes (chocolate, vanilla, strawberry, and the "not - so - secret" Neopolitan, which is all three previous flavors mixed together), and soda . In - N - Out serves soda from two different companies . It serves Coca - Cola Classic, Diet Coke, and Barq's Famous Olde Tyme Root Beer from the Coca - Cola Company, and 7 Up and Dr Pepper from the Dr Pepper Snapple Group . The company advertises that its milkshakes are made with "100% real ice cream ." </P>

Where does in and out burger get their beef