Pad Thai is a popular Thai noodle dish that is typically made with rice noodles. The noodles used are thin, flat rice noodles. Other common ingredients include bean sprouts, garlic chives, scrambled egg, firm tofu, and a protein such as chicken, shrimp, pork, or beef. The dish is flavored with a sweet-savory-sour sauce that is typically made with tamarind juice, fish sauce, dried shrimp, garlic, shallots, red chili pepper, and palm sugar. The sauce is often scattered with crushed peanuts and served with lime wedges. Vegetarian versions may substitute soy sauce for the fish sauce and omit the shrimp entirely.