Sweet tea is an interesting example actually, in that McDonalds made it available nationally 10 years ago. There is a certain amount of culinary darwinism at p

Sweet tea is an interesting example actually, in that McDonalds made it available nationally 10 years ago. There is a certain amount of culinary darwinism at play here, where the strongest regional foods have gone national over the last couple of decades. See also, Chipotle scaling the Mission burrito to thousands of stores.