Deep dish pizza and other American classics
Some of the world's most popular foods and dishes are American. Once they're world-famous, their humble beginnings are forgotten.
Henry J. Heinz and L. Clarence Noble founded Heinz & Noble in 1869 to sell horseradish sauce. Heinz ketchup debuted in the US in 1876 and the UK 10 years later.
Deep-dish pizza was supposedly conceived in 1943 at Chicago's Pizzeria Uno. Parbaked bread is layered with cheese, pepperoni, tomato sauce etc.
Deep-dish Chicago pizza
McDonald's officials repeatedly rejected Michael James 'Jim' Delligatti's concept for a double-patty burger. The new burger had a sesame seed bun and unique sauce.
Millions of people start their day with Frosted Flakes since 1952. Today, it's one of the best-selling cereals in America and abroad, thanks to mascot Tony the Tiger.
Hawaiian cheesecake is topped with pineapple, but in the UK it's made with cream cheese and isn't baked.
In the early 1900s, peanut butter was a luxury offered in Manhattan tea salons. It wasn't until the 1920s that the peanut butter sandwich became popular.
Peanut Butter & sandwich