This La Mesa diner does burgers in the classic style: sesame seed bun, lettuce, tomato and cheese, but adds a couple of cool variations. For instance, the pastrami here is first-rate and it goes great on the appropriately named Pastrami Burger. It’s piled high on a ⅓ pound burger. Gus’s also takes advantage of its Greek menu with a Gyros burger, although I would ask for feta along with the mozzarella cheese. As burger toppings go, tzatziki sauce is underrated. The fries are crispy, with just enough salt for flavor.