Of Hot Oil

It sounds like you are referring to "hot oil" as a condiment or topping that is sometimes found in restaurants in the USA. One possibility is that you are referring to chili oil, which is commonly used in Asian cuisine. Chili oil is made by infusing oil with chili peppers, and it can range in heat level from mild to very spicy. It is often used as a condiment for dumplings, noodles, and other dishes. Another possibility is that you are referring to garlic oil, which is made by infusing oil with garlic and is sometimes used as a topping for bread or other dishes. If you could provide more context or details about where you have seen this "hot oil," I may be able to provide a more specific answer.