Hot dog bun
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A hot dog bun is a type of bun shaped specifically to contain a hot dog. There are two basic types: top loading, which is popular in New England, and side loading, preferred in the South and Midwest United States.
The advantages to a top loader are that it holds the hot dog securely and fits nicely into little three sided paper boxes. Top loaders are generally baked side by side and torn apart as needed, leaving a flat side surface for grilling.
Side loaders, tend to be doughier, so are more likely to successfully sop up all the juices from chili or sauerkraut without falling apart.