McBell
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Which means it is in violation of (from your link:"In the US, a court in Boston, Massachusetts, ruled in 2006 that a sandwich includes at least two slices of bread"
- Sandwich - Wikipedia
Not that I'm saying Wiki is the final authority.
In the 21st century there has been considerable debate over the precise definition of sandwich, and specifically whether a hot dog or open sandwich can be categorized as such. In the United States, the Department of Agriculture and the Food and Drug Administration are the responsible agencies. The USDA uses the definition, "at least 35% cooked meat and no more than 50% bread" for closed sandwiches, and "at least 50% cooked meat" for open sandwiches.[4]