From Wikipedia:

The modern sandwich is named after Lord Sandwich, but the exact circumstances of its invention and original use are still the subject of debate. A rumour in a contemporaneous travel book called Tour to London by Pierre-Jean Grosley formed the popular myth that bread and meat sustained Lord Sandwich at the gambling table. But Sandwich was into many bad habits, including the Hellfire club, and any story may be a creation after the fact. [21] Lord Sandwich was a very conversant gambler, the story goes, and he did not take the time to have a meal during his long hours playing at the card table. Consequently, he would ask his servants to bring him slices of meat between two slices of bread, a habit well known among his gambling friends. Other people, according to this account, began to order "the same as Sandwich!", and thus the "sandwich" was born.[22] The sober alternative to this account is provided by Sandwich's biographer N. A. M. Rodger, who suggests that Sandwich's commitments to the navy, to politics, and to the arts mean that the first sandwich was more likely to have been consumed at his work desk.

The original sandwich was a piece of salt beef between two slices of toasted bread.

Enough.
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Old Goat Looking For A Few Good Sheep

Is a hot dog a sandwich? -- no, but maybe.

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