Imagine a compass.
At the cardinal points are, starting at north and proceeding clockwise, Highland's Bar and Grill, Pete's Famous Hot Dogs, The Bright Star, and Milo's. So you have north-south and east-west symmetry between the two major food groups (which are, of course "delicious high-quality fare prepared with pride and precision" and "delicious cheap-ass fare that's probably deadly somehow").
In every other direction?
An untamed ocean of barbecue.
(This theory doesn't account for Nikki's West, and so needs more work...)