Salad Box is a popular fast-casual restaurant chain in Bulgaria that focuses on serving fresh, customizable salads. The concept revolves around offering healthy, nutritious meals made from high-quality ingredients, allowing customers to choose from a wide variety of toppings, proteins, dressings, and greens to create their perfect salad. Salad Box's menu also includes other options like wraps and bowls, making it a versatile choice for those seeking healthy meal options.