Advise
Make sure you use a neutral oil that is safe for frying at higher temperatures. Canola oil, peanut oil, sunflower oil, or corn oil will work. If you want to reuse the oil, let it cool and strain it. You can use it multiple times for multiple batches of donuts.
Don’t overheat the oil, or the donuts will burn before the batter is cooked. Use a thermometer to heat the oil to about 350°F. Also, don’t let the oil get too cold, or the donuts will soak up too much oil, making them soggy and greasy. If you don’t have a thermometer, test the temperature using a piece of bread. When you think the oil is ready, dip a piece of bread into the oil. If it bubbles slightly and turns golden brown, it’s ready to use. If bubbles form too quickly, the oil may be too hot. If it doesn’t bubble, let the oil get hotter.
