For no-frills poutine in Quebec City that is straight-up tasty, Chez Ashton is the place to go. You can't go wrong with the classic poutine, but anyone who wants to kick it up a notch should definitely go with the spicy sauce, which you can get on any kind of poutine. For another added touch, throw on some sausages too.
Quebec City's answer to Shake Shack does things a tad bit differently. Instead of using standard French fries, Le Chic Shack's “poutine classique” includes smashed baby potatoes, which does add a little something extra to the dish. Vegetarians will also be pleased to hear Le Chic Shack has a veggie poutine just for them, topped with a mushroom gravy and big ol' chunks of cheese curds that make up for the lack of meat.