Beef Bourguignon is most commonly and traditionally served with garlic toasted croutons.
Although sometimes Beef Bourguignon may also be served with other foods such as garnish of Burgundy, made with mushrooms, bacon and onions glazed brown.
The wine from Burgundy is also traditionally used or served with the Beef Bourguignon as well.
The Beef Bourguignon is also sometimes served with steamed potatoes, pasta, macaroni and other steamed noodles.
You can basically serve the Beef Bourguignon alongside or with whatever you prefer.