McDonald's is a well-known fast food chain that has several locations in San Sebastian. They offer a variety of burger options, from classic Big Macs to specialty burgers with unique toppings. The patties are made with 100% beef, resulting in a juicy and flavorful burger. The buns are soft and slightly toasted, and the toppings are fresh and satisfying. McDonald's also offers a variety of sides, such as crispy fries and chicken nuggets, to accompany your burger. With its convenient locations and quick service, McDonald's is a popular choice for a fast and satisfying burger in San Sebastian.