US locations: 92
What it is: Meeting somewhere at the confluence of a Parisian cafe, a London fashion district coffee shop, Starbucks, and Great Harvest, Pret specializes in bistro-style sandwiches, salads, pastries, soups, and coffee, all with an eye toward healthier choices and fresh ingredients. And while ultra-English offerings like coronation chicken didn't cross the pond, they've made their name with such offerings as a cucumber-topped tuna salad, balsamic chicken & avocado, and a take on the Thanksgiving sandwich that won't leave you in a coma.
Why it could blow up: Pret's been on a (probably wheat) roll, taking advantage for increasing demand for smarter eating options in an American sandwich landscape populated by cold cuts, cheese sauce, and ice burg lettuce. It's a place that manages to feel upscale while catering to the grab-and-go crowd. Oh, and it's been doing avocado toast since before it became cool, then not cool, then the norm.