The Big Mac.

It is the quintessential American food. It combines the American love of the hamburger, with fast food, and global capitalism. It is used, because of its prevalence across the world, as a bench mark for purchasing power. The Big Mac is a symbol of American globalism, for many. The only one you could argue has more prevalence would be Coca-Cola. But... that is a story for another time.

How does this relate to the Cold War? McDonald's, being the gold standard of global American capitalism, was not in the Soviet Union. It was private business, and within the constraints of Russian Communism, was not allowed to run within the borders of the Red State. That is, until the beginning of the collapse of the Soviet Union. As, a great historian has said, Gorbachev shook hands with both Ronalds, Reagan and McDonalds. The first McDonalds, with their Big Macs, opened on Red Square in Moscow in 1990. It quickly became one of the busiest McDonalds in the world. Big Macs, fries, and cokes, came to the Soviet Union at the eve of the fall.

It symbolized the acceptance of American capitalism into Russia. And Russians loved the Big Macs.

Could you please clarify your question a little bit?

And well, I don't see any other answers, so I'll take a stab at this. I took a "Cold War America" history class as an undergraduate, and so I know a little bit about this... I think.

Anything canned could represent the feeling of preparedness for disaster felt by Americans. Alternatively, microwavable food in disposable packaging (AKA the TV Dinner) could be representative of the burgeoning consumer culture, where speed, disposability, and technology were prized over quality and nutrition.

Microwaveable food also showed the prevalence of microwaves, which were new and fairly expensive appliances. This showed a larger and wealthier middle class of Americans who could afford fairly redundant contraptions. The prevalence of microwavable food showed the wide distribution of microwaves.

The microwave was also a descendant of military technology. The microwave showed the huge impact of military technology in the civilian world, which in turn could represent the impact of the military in American culture and society in general.

Source:

Joshua Gitelson, "Populox: The Suburban Cuisine of the 1950s." Journal Of American Culture (01911813) 15, no. 3: 73-78. America: History & Life, EBSCOhost (accessed May 13, 2015).

(I highly recommend reading that for additional information).