had to google that one. The inventor of the hamburger is in dispute. However... technically it is a sandwich and from Wikipedia:
The sandwich is the namesake of John Montagu, 4th Earl of Sandwich.
A sandwich is a food item, consisting of two or more slices of bread with one or more fillings between them.
The first written usage of the English word appeared in Edward Gibbon's journal, in longhand, referring to "bits of cold meat" as a "Sandwich". It was named after John Montagu, 4th Earl of Sandwich, an 18th-century English aristocrat, although he was neither the inventor nor sustainer of the food. It is said that he ordered his valet to bring him meat tucked between two pieces of bread, and because Montagu also happened to be the Fourth Earl of Sandwich, others began to order "the same as Sandwich!" It is said that Lord Sandwich was fond of this form of food because it allowed him to continue playing cards, particularly cribbage, while eating without getting his cards greasy from eating meat with his bare hands.
The rumour in its familiar form appeared in Pierre-Jean Grosley's Londres (Neichatel, 1770), translated as A Tour to London 1772; Grosley's impressions had been formed during a year in London in 1765. The sober alternative is provided by Sandwich's biographer, N. A. M. Rodger, who suggests Sandwich's commitments to the navy, to politics and the arts mean the first sandwich was more likely to have been consumed at his desk.
Before being known as sandwiches, the food seems to simply have been known as "bread and meat" or "bread and cheese"
Sandwiches consist of two basic types, hot and cold.
TPBM prefers tacos.
Dance in the heart of chaos. . . . .
ὁ δὲ ἀνεξέταστος βίος οὐ βιωτὸς ἀνθρώπῳ
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