Sambal Oelek is relatively easy to find in most Australian supermarkets, but I haven't found it harder to find in regular American supermarkets, so I ended up using Sriracha instead. If you are using Sriracha, you may want to use a little bit more than 1 tablespoon depending on how spicy you like it! Sriracha is a lot milder compared to Sambal Oelek so keep adding a little bit at a time until you reach your desired taste. Sambal Oelek is quite spicy which is why we recommend to only use 1 teaspoon. You can also just blitz some fresh red chilis in a food processor as well for flavour, basically the same thing as Sambal Oelek!