The Thai House, run by cousins Timmy Junbua and Ae Thanoosorn, is so authentic it maintains two menus, one in English and one in Thai. They are not the same. If you know your Thai, you can order dishes that might sear a Westerner's mouth but please the native tongue -- for example, kuay-tiaw-ruar, a medley of Thai noodles, broccoli, and beef in a mix of strong spices (starting at $7.95). On the English-language side, specialties include diamond duck, a deep-fried duck served with dry fried onions, garlic, and roasted hot peppers ($18.95). In South Beach's ever-shifting landscape, Thai House has survived for nine years, testament to how well the cousins do their job.