Burgers and dogs are de rigeur for summertime cookouts, but think of this sandwich as the crave-worthy French cousin. Steak dials up the refinement, while the bread, slathered with butter and grilled, makes a beautiful platform for juicy beef slices, cheddar cheese, charred onions, and BBQ sauce. Paired with savory grilled corn, this is a dish that’s just elegant enough to belie its very simple preparation.