Rajah extra hot chilli powder is a spice blend made from dried red chili peppers. It is commonly used in Indian and Southeast Asian cuisine to add heat and flavor to dishes such as curries, stews, and stir-fries. The exact heat level of Rajah extra hot chilli powder can vary, so tasting the mixture before adding it to a recipe is a good idea. It can be substituted with other hot spice blends such as cayenne pepper, but the amount needed will vary depending on the recipe.