Bring frying oil to 350°F before adding your food to ensure evenly cooked and crispy results. A thermometer is the best tool for the job, but you can also test the oil in other ways! Toss a single popcorn kernel in the pot — if it pops, the oil is hot enough. Or, place the handle of a wooden spoon into the oil. It’s at temperature if bubbles form around the handle and roll up the sides.