Sambal oelek is a vinegar-based hot sauce that’s typically made from red chile peppers, salt and vinegar. (You can make your own by pureeing these ingredients in a food processor.) The sauce hails from Indonesia, and it’s often found in the grocery store aisle with foods from Asia. Popular substitutes include sauces such as Sriracha, which is sweeter (you can add a little garlic), or try a garlic and chili sauce.