Warning: Reading this could make you hungry.

That's because we're talking about barbecue - the "low and slow” cooking method that's a hallmark of American culture.

Obviously, meat cooked over heat can be found in great-tasting forms all over the world - roasted, baked, grilled, all the ways. Many of them are regulars on the American plate.

But there's something about the way barbecue developed in the US, cuts of meat made falling-off-the-bone tender through hours of cooking over indirect heat or smoke at lower temperatures, often with a sauce used as a marinade or for basting or perhaps a mix of dry spices. See: Ribs. Brisket. Pork shoulder. (You're hungry, aren't you. Told you.)

The roots of what's become American barbecue go back before the U.S. officially even became a country, says Robert F. Moss, contributing barbecue editor for "Southern Living” magazine and author of Barbecue, The History of American Institution.

It's a mix of influences, he says, starting between the indigenous peoples already here with their own cooking methods, the colonists who came from Europe with livestock new to the Americas and the enslaved Africans with their own cultures and traditions forcibly brought over and put to work.

"A lot of visitors to the United States... called out barbecue as being a particular American kind of thing,” Moss says. "From the very beginning, it was something distinctive to the Americas and something that Europeans recognised as being something different than the way they cooked meat.”

The development of what we think of as barbecue today had other influences over the centuries, like commercial refrigeration of the late 19th century and the subsequent popularity of the in-home version in the early decades of the 20th, which allowed people to buy and store cuts of meat in ways impossible in colonial times.

Another hallmark of American barbecue culture is how regional it is, with different sauces and cooking techniques in North Carolina vs Memphis vs Texas vs Georgia. Moss says that developed in the early part of the 20th century.

A local cook might start a restaurant and teach barbecue to his employees, who then went out on their own.

"You can literally map out these barbecue mentors who sort of spun out all these other cooks, and you can see how their style sort of was handed down from one generation to the next,” Moss says. "And that’s where you start seeing all the things we think of as the iconic.” – AP

This article is part of a recurring series by AP, 'American Objects', marking the 250th anniversary of the United States.