Sriracha hot sauce is a mild to hot Thai chile sauce used as commonly as ketchup. Sriracha is made from chilies which are ground into a smooth paste along with garlic.
The sauce is used in soups, sauces, pastas, pizzas, hot dogs, hamburgers, chow mein or on anything to add a spicy taste.
Look for this sauce in any Asian grocery store. Sriracha has become so popular in the U.S. that you may even find it at your local well-stocked grocery store. You can also purchase it online at Amazon.com: Huy Fong - Sriracha Hot Chili Sauce