How to Tell If the Hot Oil Is at Temperature in a Cast Iron Pan?
If you don't have a thermometer handy, you can employ the breadcrumb test: drop a small piece into the oil, and if it browns in about 60 seconds, the oil is likely ready. Additionally, a wooden chopstick or the end of a wooden spoon inserted into the oil will create bubbles around it when the oil is sufficiently hot. Always exercise caution and adhere to safety measures when working with hot oil and cast iron pans!