Which vinaigrette is referred to as Houstons' original?

The vinaigrette referred to as Houston's original is the one specifically labeled "Houstons' Original Vinaigrette." This designation indicates that it is a signature dressing unique to the Houston's menu, likely crafted to embody the restaurant's original flavor profile and recipes. The name itself not only ties the dressing directly to the brand but also highlights its importance and recognition among patrons as a staple item.

In contrast, while the other dressings mentioned may be popular or delicious in their own right, they do not carry the same branding or historical significance to the restaurant as the original vinaigrette. Each of these alternatives serves different culinary purposes and flavors, but they do not represent the foundational essence that "Houstons' Original Vinaigrette" does within the context of the restaurant's offerings.