The sign in the window proudly proclaims it as the “HOME OF THE WORLD FAMOUS HUCKLEBERRY MILKSHAKE,” and generations of Idahoans will testify that this isn’t mere hyperbole – it’s gospel truth.

The scene inside the Emporium becomes a cross-generational tableau – grandmothers reminiscing about picking huckleberries as children, mothers enjoying a rare moment of being served rather than ...