Paul Rothe & Son

You'll find Paul Rothe & Son wedged on a narrow stretch of Marylebone Lane, the kind of place that feels like it's been there forever because, well, it basically has. Step inside and you're greeted with vintage tiled walls, wooden counters, and glass cabinets stuffed with proper salami, pâté, and imported meats that frankly make most modern delis look a bit embarrassing. Order at the counter (expect a queue, it moves fast), watch them build your sandwich with genuine care, and grab a stool by the window if you're lucky. The regulars come for lunch, tourists stumble in by accident, and everyone leaves satisfied.