Pad Thai is a popular Thai noodle dish that is made with thin, flat rice noodles. The noodles are typically soaked in room temperature water until they are pliable yet firm before being used in the dish. Other common ingredients in Pad Thai include bean sprouts, garlic chives, scrambled egg, firm tofu, and a protein such as chicken, shrimp, pork, or beef. The dish is typically seasoned with a sweet-savory-sour sauce that includes ingredients such as fish sauce, vinegar, sugar, and tamarind paste. However, if tamarind paste is not available, rice vinegar or even ketchup can be used as a substitute. The dish is often topped with crushed peanuts and served with lime wedges on the side.