Assuming this is a serious question, no. There was no equivalent of contemporary fast food franchises. You could not have traveled cities and gotten the same product from the same store/company, because those type of large businesses just didn't exist, especially for prepared food shops which were often associated with the lower classes.

However, the lack of fast food businesses that follow the contemporary model of fast food franchises does not mean there weren't food vendors that would've, likely, served similar products in entertainment venues and urban centers across the empire. Thermopolium were essentially quick service meal venues where hot food (or maybe just nuts? archeologists disagree on this) were served. Pompeii had at least 80 of them-- bar like counters with embedded holes to keep food or stew being served hot. These venues primarily serviced the lower class, who could not afford their own private kitchens. This is also evidenced by their reputation for encouraging drunkenness and damaging the public sphere, which Plautus recorded. Similar to modern day fast food franchises you're asking about, these locations were counter service, takeout establishments. There might've been places to congregate around the storefront, and they operated loosely as sites of social gathering, but it's definitely meant for food on the go. Stephen Dyson, a professor of classics at the University of Buffalo described them (for Smithsonian magazine, so take this with a grain of salt) as a cross between a burger king (minus the burger) and a snack bar. These venues definitely weren't limited to Pompeii, and we have ample evidence of their existence in Rome and across the empire, but Pompeii gives us the most extensive archeological evidence both for their existence and for their ubiquity,

There were likely similarities between what was served at these establishments, in accordance with contemporaneous foodways. As your question suggests, Garum (or a fermented fish sauce probably somewhat similar to east asian fish sauces) probably would've been a condiment available, as it was extremely popular in ancient Rome. While we don't have awesome evidence on the price point of Garum there have been lots of fairly large vessels found that contained it.

Most evidence we have on food in the Roman empire comes from texts that mostly detail the lives of the upper class. Meat would've likely been prohibitively expensive for most frequenters of such establishments, so assume there wouldn't have been any bacon anything on the menu. The main extant cookbook we have from Ancient Rome by Apicius also isn't much help here, as the recipes in it also catered to the upper classes. They definitely weren't serving burger and fries, as there were no potatoes, and the burger wasn't a legible concept, at all. Most archeologists who write on Thermopolia refrain from guessing on exactly what food was served (though most agree that wine and mulled wine definitely was, many had shrines to Dionysus within them) mostly because we just don't have good evidence, written or archeological. Breads, cheeses, nuts, honey, legumes, and some fish and meat products and stews were significant parts of the ancient lower class diet. The landscape for eating wasn't as bleak as is often implied by the existence of wheat handouts to the lower classes.