Oil Temperature for Frying Doughnuts
You need a thermometer. I know, I know, it sounds like extra work. But eyeballing it is like trying to knit a sweater with your eyes closed. A clip-on candy or deep-fry thermometer is your best friend. It costs less than a box of fancy doughnuts and will save you batches of grief.
how to check the oil temperature | with out any tool | donuts best
No thermometer? You can try the "wooden spoon test." Stick the handle of a wooden spoon into the oil. If tiny bubbles form around it steadily, you're in the zone. If it erupts like a geyser, turn the heat down. If nothing happens, wait.