Hot Dog Express is a hidden gem near the Madrid Royal Palace. This family-owned hot dog joint has been serving delicious hot dogs for years. They offer a variety of options, including classic hot dogs with traditional toppings like mustard and relish, as well as specialty hot dogs with unique flavors. The hot dogs are made with high-quality ingredients and served on freshly baked buns. The friendly staff and cozy atmosphere make Hot Dog Express a favorite among locals. Whether you're looking for a quick snack or a satisfying meal, Hot Dog Express is the place to go.