Dining at Mainlander (8 South Euclid Avenue) is not only a great meal, it's an experience that transports diners to mid-century America, complete with all the period's nostalgic kitsch. But don't let the stylish trappings fool you: owners Gordon Chen and Blake Askew have sunk just as much effort (and likely more) in creating a prix-fixe menu full of flawlessly executed dishes.